Re-organizes the GRPC_ROOT detection code in extconf.rb
Re-organizes the GRPC_ROOT detection code in extconf.rb

rjshade/grpc,nicolasnoble/grpc,maxwell-demon/grpc,donnadionne/grpc,soltanmm-google/grpc,mway08/grpc,ananthonline/grpc,carl-mastrangelo/grpc,simonkuang/grpc,sidrakesh93/grpc,zhimingxie/grpc,podsvirov/grpc,pszemus/grpc,ipylypiv/grpc,a-veitch/grpc,tamihiro/grpc,MakMukhi/grpc,msiedlarek/grpc,ejona86/grpc,chrisdunelm/grpc,yongni/grpc,zhimingxie/grpc,thinkerou/grpc,stanley-cheung/grpc,crast/grpc,surround-io/grpc,wkubiak/grpc,larsonmpdx/grpc,geffzhang/grpc,xtopsoft/grpc,MakMukhi/grpc,stanley-cheung/grpc,y-zeng/grpc,ananthonline/grpc,crast/grpc,kskalski/grpc,MakMukhi/grpc,firebase/grpc,podsvirov/grpc,7anner/grpc,pmarks-net/grpc,thunderboltsid/grpc,andrewpollock/grpc,thunderboltsid/grpc,pszemus/grpc,yonglehou/grpc,msiedlarek/grpc,ctiller/grpc,hstefan/grpc,a-veitch/grpc,madongfly/grpc,JoeWoo/grpc,7anner/grpc,mway08/grpc,LuminateWireless/grpc,stanley-cheung/grpc,firebase/grpc,fuchsia-mirror/third_party-grpc,pszemus/grpc,Vizerai/grpc,cgvarela/grpc,mehrdada/grpc,nicolasnoble/grpc,perumaalgoog/grpc,kriswuollett/grpc,goldenbull/grpc,donnadionne/grpc,a-veitch/grpc,jboeuf/grpc,wangyikai/grpc,cgvarela/grpc,Crevil/grpc,goldenbull/grpc,fichter/grpc,ananthonline/grpc,tempbottle/grpc,surround-io/grpc,ncteisen/grpc,tamihiro/grpc,jcanizales/grpc,Vizerai/grpc,firebase/grpc,leifurhauks/grpc,sidrakesh93/grpc,makdharma/grpc,nicolasnoble/grpc,7anner/grpc,donnadionne/grpc,tamihiro/grpc,daniel-j-born/grpc,infinit/grpc,kriswuollett/grpc,thunderboltsid/grpc,infinit/grpc,philcleveland/grpc,wkubiak/grpc,apolcyn/grpc,muxi/grpc,firebase/grpc,adelez/grpc,pmarks-net/grpc,chrisdunelm/grpc,VcamX/grpc,adelez/grpc,baylabs/grpc,leifurhauks/grpc,goldenbull/grpc,VcamX/grpc,quizlet/grpc,crast/grpc,a-veitch/grpc,xtopsoft/grpc,7anner/grpc,ofrobots/grpc,w4-sjcho/grpc,a11r/grpc,ppietrasa/grpc,sreecha/grpc,ejona86/grpc,fichter/grpc,vjpai/grpc,larsonmpdx/grpc,kriswuollett/grpc,wkubiak/grpc,larsonmpdx/grpc,soltanmm/grpc,dgquintas/grpc,kpayson64/grpc,gpndata/grpc,dgquintas/grpc,ejona86/grpc,mway08/grpc,yonglehou/grpc,grani/grpc,greasypizza/grpc,ctiller/grpc,chrisdunelm/grpc,tempbottle/grpc,jcanizales/grpc,tempbottle/grpc,grpc/grpc,w4-sjcho/grpc,tempbottle/grpc,wcevans/grpc,thinkerou/grpc,JoeWoo/grpc,arkmaxim/grpc,msmania/grpc,stanley-cheung/grpc,zeliard/grpc,ofrobots/grpc,philcleveland/grpc,jboeuf/grpc,pmarks-net/grpc,dgquintas/grpc,matt-kwong/grpc,carl-mastrangelo/grpc,sidrakesh93/grpc,a11r/grpc,gpndata/grpc,Crevil/grpc,wcevans/grpc,goldenbull/grpc,yang-g/grpc,carl-mastrangelo/grpc,chrisdunelm/grpc,soltanmm-google/grpc,sidrakesh93/grpc,fuchsia-mirror/third_party-grpc,stanley-cheung/grpc,msmania/grpc,malexzx/grpc,cgvarela/grpc,simonkuang/grpc,yugui/grpc,yongni/grpc,zhimingxie/grpc,jboeuf/grpc,thunderboltsid/grpc,soltanmm/grpc,a-veitch/grpc,surround-io/grpc,w4-sjcho/grpc,dklempner/grpc,wkubiak/grpc,thinkerou/grpc,MakMukhi/grpc,simonkuang/grpc,PeterFaiman/ruby-grpc-minimal,makdharma/grpc,jtattermusch/grpc,murgatroid99/grpc,muxi/grpc,matt-kwong/grpc,ejona86/grpc,VcamX/grpc,ksophocleous/grpc,bjori/grpc,ksophocleous/grpc,kpayson64/grpc,grani/grpc,wkubiak/grpc,dklempner/grpc,deepaklukose/grpc,kskalski/grpc,PeterFaiman/ruby-grpc-minimal,thunderboltsid/grpc,kskalski/grpc,yang-g/grpc,sidrakesh93/grpc,jtattermusch/grpc,thunderboltsid/grpc,miselin/grpc,bjori/grpc,kumaralokgithub/grpc,bjori/grpc,ejona86/grpc,andrewpollock/grpc,deepaklukose/grpc,miselin/grpc,stanley-cheung/grpc,gpndata/grpc,tengyifei/grpc,apolcyn/grpc,perumaalgoog/grpc,wangyikai/grpc,a-veitch/grpc,murgatroid99/grpc,donnadionne/grpc,thinkerou/grpc,zeliard/grpc,LuminateWireless/grpc,bogdandrutu/grpc,msmania/grpc,simonkuang/grpc,maxwell-demon/grpc,rjshade/grpc,yang-g/grpc,bogdandrutu/grpc,ctiller/grpc,muxi/grpc,ncteisen/grpc,LuminateWireless/grpc,wangyikai/grpc,zeliard/grpc,doubi-workshop/grpc,jtattermusch/grpc,jboeuf/grpc,Crevil/grpc,firebase/grpc,geffzhang/grpc,a-veitch/grpc,firebase/grpc,crast/grpc,zhimingxie/grpc,carl-mastrangelo/grpc,PeterFaiman/ruby-grpc-minimal,tengyifei/grpc,vsco/grpc,ppietrasa/grpc,Vizerai/grpc,jtattermusch/grpc,stanley-cheung/grpc,ofrobots/grpc,soltanmm-google/grpc,bjori/grpc,sreecha/grpc,kumaralokgithub/grpc,rjshade/grpc,kriswuollett/grpc,daniel-j-born/grpc,Crevil/grpc,greasypizza/grpc,xtopsoft/grpc,greasypizza/grpc,ananthonline/grpc,ofrobots/grpc,tempbottle/grpc,donnadionne/grpc,podsvirov/grpc,andrewpollock/grpc,fichter/grpc,sreecha/grpc,quizlet/grpc,hstefan/grpc,ksophocleous/grpc,murgatroid99/grpc,thinkerou/grpc,pmarks-net/grpc,jtattermusch/grpc,kriswuollett/grpc,firebase/grpc,soltanmm/grpc,bogdandrutu/grpc,kumaralokgithub/grpc,ncteisen/grpc,surround-io/grpc,zhimingxie/grpc,kpayson64/grpc,thunderboltsid/grpc,malexzx/grpc,PeterFaiman/ruby-grpc-minimal,surround-io/grpc,msmania/grpc,kumaralokgithub/grpc,tengyifei/grpc,muxi/grpc,perumaalgoog/grpc,geffzhang/grpc,malexzx/grpc,thinkerou/grpc,ejona86/grpc,ananthonline/grpc,fuchsia-mirror/third_party-grpc,tamihiro/grpc,Vizerai/grpc,vjpai/grpc,thinkerou/grpc,tengyifei/grpc,grani/grpc,pszemus/grpc,sidrakesh93/grpc,w4-sjcho/grpc,matt-kwong/grpc,meisterpeeps/grpc,arkmaxim/grpc,crast/grpc,soltanmm/grpc,grpc/grpc,msiedlarek/grpc,soltanmm/grpc,sreecha/grpc,meisterpeeps/grpc,adelez/grpc,perumaalgoog/grpc,vsco/grpc,malexzx/grpc,infinit/grpc,apolcyn/grpc,dgquintas/grpc,fuchsia-mirror/third_party-grpc,deepaklukose/grpc,nicolasnoble/grpc,miselin/grpc,fuchsia-mirror/third_party-grpc,LuminateWireless/grpc,doubi-workshop/grpc,cgvarela/grpc,gpndata/grpc,greasypizza/grpc,ananthonline/grpc,muxi/grpc,sreecha/grpc,maxwell-demon/grpc,matt-kwong/grpc,arkmaxim/grpc,larsonmpdx/grpc,ejona86/grpc,LuminateWireless/grpc,jcanizales/grpc,quizlet/grpc,deepaklukose/grpc,mehrdada/grpc,baylabs/grpc,wcevans/grpc,bjori/grpc,mehrdada/grpc,sreecha/grpc,msiedlarek/grpc,philcleveland/grpc,madongfly/grpc,madongfly/grpc,grani/grpc,dklempner/grpc,ctiller/grpc,arkmaxim/grpc,jboeuf/grpc,makdharma/grpc,zhimingxie/grpc,doubi-workshop/grpc,Vizerai/grpc,matt-kwong/grpc,yugui/grpc,ctiller/grpc,ppietrasa/grpc,mehrdada/grpc,w4-sjcho/grpc,bjori/grpc,grani/grpc,ctiller/grpc,murgatroid99/grpc,soltanmm/grpc,jboeuf/grpc,daniel-j-born/grpc,podsvirov/grpc,dgquintas/grpc,quizlet/grpc,a11r/grpc,ctiller/grpc,carl-mastrangelo/grpc,w4-sjcho/grpc,jboeuf/grpc,ppietrasa/grpc,vjpai/grpc,stanley-cheung/grpc,yugui/grpc,ncteisen/grpc,grpc/grpc,daniel-j-born/grpc,jboeuf/grpc,doubi-workshop/grpc,wcevans/grpc,grpc/grpc,larsonmpdx/grpc,chrisdunelm/grpc,madongfly/grpc,w4-sjcho/grpc,andrewpollock/grpc,zhimingxie/grpc,Crevil/grpc,royalharsh/grpc,adelez/grpc,soltanmm-google/grpc,pszemus/grpc,kpayson64/grpc,pmarks-net/grpc,greasypizza/grpc,msiedlarek/grpc,zeliard/grpc,madongfly/grpc,yinsu/grpc,zeliard/grpc,ksophocleous/grpc,VcamX/grpc,mway08/grpc,apolcyn/grpc,tempbottle/grpc,kpayson64/grpc,nicolasnoble/grpc,LuminateWireless/grpc,miselin/grpc,baylabs/grpc,andrewpollock/grpc,ksophocleous/grpc,w4-sjcho/grpc,pszemus/grpc,soltanmm/grpc,fichter/grpc,grani/grpc,cgvarela/grpc,grpc/grpc,pszemus/grpc,ofrobots/grpc,donnadionne/grpc,adelez/grpc,PeterFaiman/ruby-grpc-minimal,msiedlarek/grpc,yinsu/grpc,goldenbull/grpc,kpayson64/grpc,grani/grpc,arkmaxim/grpc,murgatroid99/grpc,infinit/grpc,ncteisen/grpc,leifurhauks/grpc,royalharsh/grpc,donnadionne/grpc,geffzhang/grpc,yonglehou/grpc,ncteisen/grpc,mway08/grpc,thinkerou/grpc,infinit/grpc,firebase/grpc,bogdandrutu/grpc,grani/grpc,doubi-workshop/grpc,larsonmpdx/grpc,jcanizales/grpc,ejona86/grpc,perumaalgoog/grpc,zeliard/grpc,kskalski/grpc,JoeWoo/grpc,infinit/grpc,vsco/grpc,baylabs/grpc,adelez/grpc,royalharsh/grpc,chrisdunelm/grpc,y-zeng/grpc,gpndata/grpc,JoeWoo/grpc,y-zeng/grpc,sidrakesh93/grpc,podsvirov/grpc,JoeWoo/grpc,vjpai/grpc,chrisdunelm/grpc,hstefan/grpc,arkmaxim/grpc,matt-kwong/grpc,Vizerai/grpc,Crevil/grpc,leifurhauks/grpc,sreecha/grpc,LuminateWireless/grpc,dklempner/grpc,royalharsh/grpc,yonglehou/grpc,PeterFaiman/ruby-grpc-minimal,tengyifei/grpc,ejona86/grpc,jboeuf/grpc,ncteisen/grpc,wangyikai/grpc,goldenbull/grpc,baylabs/grpc,perumaalgoog/grpc,goldenbull/grpc,kumaralokgithub/grpc,daniel-j-born/grpc,philcleveland/grpc,crast/grpc,muxi/grpc,jcanizales/grpc,mehrdada/grpc,msmania/grpc,tamihiro/grpc,royalharsh/grpc,pszemus/grpc,doubi-workshop/grpc,vsco/grpc,matt-kwong/grpc,ofrobots/grpc,firebase/grpc,bjori/grpc,daniel-j-born/grpc,stanley-cheung/grpc,Crevil/grpc,fuchsia-mirror/third_party-grpc,greasypizza/grpc,daniel-j-born/grpc,ncteisen/grpc,kskalski/grpc,jtattermusch/grpc,PeterFaiman/ruby-grpc-minimal,Crevil/grpc,malexzx/grpc,ppietrasa/grpc,pszemus/grpc,wcevans/grpc,philcleveland/grpc,stanley-cheung/grpc,madongfly/grpc,soltanmm-google/grpc,jboeuf/grpc,murgatroid99/grpc,tamihiro/grpc,firebase/grpc,bogdandrutu/grpc,kriswuollett/grpc,xtopsoft/grpc,cgvarela/grpc,jcanizales/grpc,nicolasnoble/grpc,vsco/grpc,surround-io/grpc,dklempner/grpc,malexzx/grpc,tamihiro/grpc,perumaalgoog/grpc,Vizerai/grpc,xtopsoft/grpc,Vizerai/grpc,ncteisen/grpc,yonglehou/grpc,murgatroid99/grpc,meisterpeeps/grpc,msmania/grpc,MakMukhi/grpc,VcamX/grpc,yinsu/grpc,grpc/grpc,vjpai/grpc,rjshade/grpc,kskalski/grpc,jcanizales/grpc,malexzx/grpc,podsvirov/grpc,mehrdada/grpc,yinsu/grpc,philcleveland/grpc,vjpai/grpc,greasypizza/grpc,vjpai/grpc,bogdandrutu/grpc,PeterFaiman/ruby-grpc-minimal,murgatroid99/grpc,perumaalgoog/grpc,pmarks-net/grpc,yugui/grpc,quizlet/grpc,kpayson64/grpc,sreecha/grpc,deepaklukose/grpc,maxwell-demon/grpc,PeterFaiman/ruby-grpc-minimal,yang-g/grpc,mehrdada/grpc,ctiller/grpc,mehrdada/grpc,meisterpeeps/grpc,yinsu/grpc,sreecha/grpc,a11r/grpc,soltanmm/grpc,VcamX/grpc,grpc/grpc,matt-kwong/grpc,vjpai/grpc,yongni/grpc,philcleveland/grpc,simonkuang/grpc,nicolasnoble/grpc,infinit/grpc,deepaklukose/grpc,grpc/grpc,jtattermusch/grpc,kpayson64/grpc,yugui/grpc,muxi/grpc,ksophocleous/grpc,ofrobots/grpc,vjpai/grpc,pmarks-net/grpc,arkmaxim/grpc,ipylypiv/grpc,ctiller/grpc,nicolasnoble/grpc,stanley-cheung/grpc,fichter/grpc,jtattermusch/grpc,geffzhang/grpc,soltanmm-google/grpc,pmarks-net/grpc,geffzhang/grpc,ctiller/grpc,ipylypiv/grpc,ananthonline/grpc,yonglehou/grpc,chrisdunelm/grpc,jcanizales/grpc,ipylypiv/grpc,sidrakesh93/grpc,geffzhang/grpc,y-zeng/grpc,yongni/grpc,yugui/grpc,miselin/grpc,ananthonline/grpc,leifurhauks/grpc,zhimingxie/grpc,donnadionne/grpc,y-zeng/grpc,yinsu/grpc,ppietrasa/grpc,dgquintas/grpc,7anner/grpc,gpndata/grpc,miselin/grpc,podsvirov/grpc,a11r/grpc,sreecha/grpc,wangyikai/grpc,ofrobots/grpc,kskalski/grpc,makdharma/grpc,cgvarela/grpc,tengyifei/grpc,apolcyn/grpc,sreecha/grpc,muxi/grpc,zhimingxie/grpc,mehrdada/grpc,chrisdunelm/grpc,kskalski/grpc,dklempner/grpc,matt-kwong/grpc,thunderboltsid/grpc,a-veitch/grpc,xtopsoft/grpc,vjpai/grpc,larsonmpdx/grpc,yongni/grpc,maxwell-demon/grpc,arkmaxim/grpc,jcanizales/grpc,dgquintas/grpc,carl-mastrangelo/grpc,yugui/grpc,y-zeng/grpc,ncteisen/grpc,quizlet/grpc,meisterpeeps/grpc,ppietrasa/grpc,surround-io/grpc,geffzhang/grpc,kumaralokgithub/grpc,wcevans/grpc,kskalski/grpc,dgquintas/grpc,soltanmm-google/grpc,7anner/grpc,pszemus/grpc,7anner/grpc,mehrdada/grpc,wangyikai/grpc,chrisdunelm/grpc,yongni/grpc,rjshade/grpc,maxwell-demon/grpc,yang-g/grpc,hstefan/grpc,kumaralokgithub/grpc,jboeuf/grpc,apolcyn/grpc,ipylypiv/grpc,apolcyn/grpc,msiedlarek/grpc,leifurhauks/grpc,perumaalgoog/grpc,kriswuollett/grpc,vsco/grpc,msmania/grpc,infinit/grpc,daniel-j-born/grpc,deepaklukose/grpc,yinsu/grpc,thunderboltsid/grpc,wkubiak/grpc,adelez/grpc,chrisdunelm/grpc,MakMukhi/grpc,malexzx/grpc,hstefan/grpc,y-zeng/grpc,a11r/grpc,baylabs/grpc,leifurhauks/grpc,ctiller/grpc,makdharma/grpc,ksophocleous/grpc,7anner/grpc,mway08/grpc,y-zeng/grpc,dgquintas/grpc,bogdandrutu/grpc,thinkerou/grpc,Vizerai/grpc,yongni/grpc,carl-mastrangelo/grpc,yinsu/grpc,VcamX/grpc,miselin/grpc,wcevans/grpc,wangyikai/grpc,mehrdada/grpc,podsvirov/grpc,zeliard/grpc,doubi-workshop/grpc,tamihiro/grpc,dklempner/grpc,nicolasnoble/grpc,vjpai/grpc,quizlet/grpc,doubi-workshop/grpc,kpayson64/grpc,andrewpollock/grpc,yonglehou/grpc,apolcyn/grpc,meisterpeeps/grpc,hstefan/grpc,tempbottle/grpc,xtopsoft/grpc,soltanmm/grpc,fichter/grpc,msmania/grpc,dklempner/grpc,kpayson64/grpc,grpc/grpc,dgquintas/grpc,soltanmm-google/grpc,meisterpeeps/grpc,quizlet/grpc,yonglehou/grpc,yang-g/grpc,dklempner/grpc,yongni/grpc,VcamX/grpc,hstefan/grpc,carl-mastrangelo/grpc,MakMukhi/grpc,yinsu/grpc,y-zeng/grpc,donnadionne/grpc,ipylypiv/grpc,xtopsoft/grpc,yongni/grpc,wcevans/grpc,greasypizza/grpc,jboeuf/grpc,rjshade/grpc,deepaklukose/grpc,tamihiro/grpc,wkubiak/grpc,andrewpollock/grpc,carl-mastrangelo/grpc,arkmaxim/grpc,madongfly/grpc,fuchsia-mirror/third_party-grpc,royalharsh/grpc,larsonmpdx/grpc,a11r/grpc,madongfly/grpc,JoeWoo/grpc,yang-g/grpc,ipylypiv/grpc,andrewpollock/grpc,ananthonline/grpc,deepaklukose/grpc,vsco/grpc,fichter/grpc,miselin/grpc,LuminateWireless/grpc,quizlet/grpc,w4-sjcho/grpc,vsco/grpc,baylabs/grpc,malexzx/grpc,rjshade/grpc,philcleveland/grpc,fuchsia-mirror/third_party-grpc,andrewpollock/grpc,geffzhang/grpc,dgquintas/grpc,makdharma/grpc,donnadionne/grpc,fuchsia-mirror/third_party-grpc,msmania/grpc,adelez/grpc,a11r/grpc,crast/grpc,maxwell-demon/grpc,cgvarela/grpc,grpc/grpc,muxi/grpc,wcevans/grpc,hstefan/grpc,surround-io/grpc,simonkuang/grpc,pmarks-net/grpc,baylabs/grpc,Vizerai/grpc,nicolasnoble/grpc,ejona86/grpc,miselin/grpc,yang-g/grpc,madongfly/grpc,thinkerou/grpc,thinkerou/grpc,grpc/grpc,kumaralokgithub/grpc,rjshade/grpc,JoeWoo/grpc,msiedlarek/grpc,nicolasnoble/grpc,zeliard/grpc,maxwell-demon/grpc,jtattermusch/grpc,soltanmm-google/grpc,JoeWoo/grpc,ksophocleous/grpc,hstefan/grpc,stanley-cheung/grpc,grpc/grpc,firebase/grpc,nicolasnoble/grpc,MakMukhi/grpc,leifurhauks/grpc,meisterpeeps/grpc,sreecha/grpc,apolcyn/grpc,donnadionne/grpc,fichter/grpc,a11r/grpc,maxwell-demon/grpc,muxi/grpc,vsco/grpc,infinit/grpc,gpndata/grpc,mway08/grpc,podsvirov/grpc,PeterFaiman/ruby-grpc-minimal,kpayson64/grpc,yugui/grpc,yugui/grpc,larsonmpdx/grpc,daniel-j-born/grpc,vjpai/grpc,tempbottle/grpc,Crevil/grpc,ipylypiv/grpc,a-veitch/grpc,rjshade/grpc,fuchsia-mirror/third_party-grpc,tengyifei/grpc,murgatroid99/grpc,jtattermusch/grpc,grani/grpc,makdharma/grpc,adelez/grpc,bogdandrutu/grpc,Vizerai/grpc,ejona86/grpc,JoeWoo/grpc,VcamX/grpc,ctiller/grpc,ofrobots/grpc,bjori/grpc,kriswuollett/grpc,jtattermusch/grpc,leifurhauks/grpc,pszemus/grpc,carl-mastrangelo/grpc,simonkuang/grpc,goldenbull/grpc,ppietrasa/grpc,pszemus/grpc,wangyikai/grpc,gpndata/grpc,wkubiak/grpc,makdharma/grpc,tengyifei/grpc,ipylypiv/grpc,yang-g/grpc,ppietrasa/grpc,baylabs/grpc,wangyikai/grpc,greasypizza/grpc,royalharsh/grpc,tengyifei/grpc,simonkuang/grpc,kriswuollett/grpc,ejona86/grpc,MakMukhi/grpc,muxi/grpc,ncteisen/grpc,royalharsh/grpc,kumaralokgithub/grpc,bogdandrutu/grpc,bjori/grpc,LuminateWireless/grpc,msiedlarek/grpc,royalharsh/grpc,ncteisen/grpc,carl-mastrangelo/grpc,muxi/grpc,crast/grpc,mway08/grpc,donnadionne/grpc,philcleveland/grpc,goldenbull/grpc,doubi-workshop/grpc,carl-mastrangelo/grpc,firebase/grpc,jtattermusch/grpc,mehrdada/grpc,murgatroid99/grpc,thinkerou/grpc,makdharma/grpc,7anner/grpc,simonkuang/grpc