Fix Windows compile error
Fix Windows compile error

ncteisen/grpc,adelez/grpc,firebase/grpc,PeterFaiman/ruby-grpc-minimal,donnadionne/grpc,nicolasnoble/grpc,donnadionne/grpc,geffzhang/grpc,daniel-j-born/grpc,thinkerou/grpc,thinkerou/grpc,ejona86/grpc,stanley-cheung/grpc,geffzhang/grpc,nicolasnoble/grpc,simonkuang/grpc,jboeuf/grpc,nicolasnoble/grpc,ejona86/grpc,chrisdunelm/grpc,jtattermusch/grpc,firebase/grpc,donnadionne/grpc,nicolasnoble/grpc,simonkuang/grpc,sreecha/grpc,jboeuf/grpc,mehrdada/grpc,fuchsia-mirror/third_party-grpc,jtattermusch/grpc,Vizerai/grpc,chrisdunelm/grpc,muxi/grpc,vjpai/grpc,firebase/grpc,vjpai/grpc,firebase/grpc,stanley-cheung/grpc,murgatroid99/grpc,Vizerai/grpc,Vizerai/grpc,muxi/grpc,kpayson64/grpc,kpayson64/grpc,ncteisen/grpc,chrisdunelm/grpc,jboeuf/grpc,pszemus/grpc,ctiller/grpc,jboeuf/grpc,dgquintas/grpc,thinkerou/grpc,muxi/grpc,murgatroid99/grpc,thinkerou/grpc,stanley-cheung/grpc,simonkuang/grpc,Vizerai/grpc,jtattermusch/grpc,ejona86/grpc,deepaklukose/grpc,vjpai/grpc,simonkuang/grpc,murgatroid99/grpc,ncteisen/grpc,nicolasnoble/grpc,simonkuang/grpc,jtattermusch/grpc,adelez/grpc,kpayson64/grpc,stanley-cheung/grpc,grpc/grpc,donnadionne/grpc,ejona86/grpc,vjpai/grpc,pszemus/grpc,chrisdunelm/grpc,sreecha/grpc,carl-mastrangelo/grpc,sreecha/grpc,ncteisen/grpc,chrisdunelm/grpc,vjpai/grpc,ejona86/grpc,ejona86/grpc,pszemus/grpc,donnadionne/grpc,stanley-cheung/grpc,Vizerai/grpc,geffzhang/grpc,carl-mastrangelo/grpc,muxi/grpc,thinkerou/grpc,deepaklukose/grpc,PeterFaiman/ruby-grpc-minimal,ctiller/grpc,murgatroid99/grpc,vjpai/grpc,mehrdada/grpc,fuchsia-mirror/third_party-grpc,ctiller/grpc,adelez/grpc,donnadionne/grpc,donnadionne/grpc,chrisdunelm/grpc,kpayson64/grpc,donnadionne/grpc,kpayson64/grpc,mehrdada/grpc,pszemus/grpc,murgatroid99/grpc,grpc/grpc,stanley-cheung/grpc,carl-mastrangelo/grpc,Vizerai/grpc,murgatroid99/grpc,muxi/grpc,sreecha/grpc,adelez/grpc,chrisdunelm/grpc,nicolasnoble/grpc,ctiller/grpc,adelez/grpc,fuchsia-mirror/third_party-grpc,jboeuf/grpc,pszemus/grpc,grpc/grpc,carl-mastrangelo/grpc,murgatroid99/grpc,ejona86/grpc,firebase/grpc,stanley-cheung/grpc,mehrdada/grpc,jboeuf/grpc,donnadionne/grpc,ctiller/grpc,daniel-j-born/grpc,dgquintas/grpc,nicolasnoble/grpc,stanley-cheung/grpc,ctiller/grpc,PeterFaiman/ruby-grpc-minimal,carl-mastrangelo/grpc,sreecha/grpc,dgquintas/grpc,geffzhang/grpc,thinkerou/grpc,dgquintas/grpc,firebase/grpc,pszemus/grpc,sreecha/grpc,sreecha/grpc,chrisdunelm/grpc,jtattermusch/grpc,daniel-j-born/grpc,PeterFaiman/ruby-grpc-minimal,pszemus/grpc,muxi/grpc,jtattermusch/grpc,ncteisen/grpc,simonkuang/grpc,sreecha/grpc,vjpai/grpc,geffzhang/grpc,grpc/grpc,jtattermusch/grpc,firebase/grpc,murgatroid99/grpc,ncteisen/grpc,mehrdada/grpc,firebase/grpc,nicolasnoble/grpc,donnadionne/grpc,geffzhang/grpc,kpayson64/grpc,mehrdada/grpc,kpayson64/grpc,carl-mastrangelo/grpc,muxi/grpc,mehrdada/grpc,ejona86/grpc,ctiller/grpc,jtattermusch/grpc,fuchsia-mirror/third_party-grpc,daniel-j-born/grpc,vjpai/grpc,sreecha/grpc,muxi/grpc,Vizerai/grpc,ejona86/grpc,pszemus/grpc,mehrdada/grpc,grpc/grpc,nicolasnoble/grpc,stanley-cheung/grpc,geffzhang/grpc,carl-mastrangelo/grpc,vjpai/grpc,grpc/grpc,jtattermusch/grpc,fuchsia-mirror/third_party-grpc,grpc/grpc,sreecha/grpc,firebase/grpc,daniel-j-born/grpc,muxi/grpc,murgatroid99/grpc,jtattermusch/grpc,vjpai/grpc,jboeuf/grpc,deepaklukose/grpc,fuchsia-mirror/third_party-grpc,simonkuang/grpc,fuchsia-mirror/third_party-grpc,pszemus/grpc,PeterFaiman/ruby-grpc-minimal,ctiller/grpc,adelez/grpc,daniel-j-born/grpc,carl-mastrangelo/grpc,fuchsia-mirror/third_party-grpc,dgquintas/grpc,carl-mastrangelo/grpc,jboeuf/grpc,thinkerou/grpc,thinkerou/grpc,ncteisen/grpc,thinkerou/grpc,mehrdada/grpc,kpayson64/grpc,nicolasnoble/grpc,jboeuf/grpc,pszemus/grpc,nicolasnoble/grpc,Vizerai/grpc,Vizerai/grpc,PeterFaiman/ruby-grpc-minimal,ncteisen/grpc,muxi/grpc,firebase/grpc,dgquintas/grpc,PeterFaiman/ruby-grpc-minimal,mehrdada/grpc,grpc/grpc,carl-mastrangelo/grpc,thinkerou/grpc,PeterFaiman/ruby-grpc-minimal,stanley-cheung/grpc,deepaklukose/grpc,adelez/grpc,adelez/grpc,dgquintas/grpc,ctiller/grpc,firebase/grpc,dgquintas/grpc,dgquintas/grpc,simonkuang/grpc,grpc/grpc,vjpai/grpc,simonkuang/grpc,kpayson64/grpc,geffzhang/grpc,daniel-j-born/grpc,dgquintas/grpc,jtattermusch/grpc,firebase/grpc,ejona86/grpc,deepaklukose/grpc,thinkerou/grpc,sreecha/grpc,kpayson64/grpc,daniel-j-born/grpc,ctiller/grpc,chrisdunelm/grpc,stanley-cheung/grpc,donnadionne/grpc,ncteisen/grpc,sreecha/grpc,PeterFaiman/ruby-grpc-minimal,deepaklukose/grpc,deepaklukose/grpc,adelez/grpc,nicolasnoble/grpc,ejona86/grpc,ncteisen/grpc,dgquintas/grpc,pszemus/grpc,PeterFaiman/ruby-grpc-minimal,pszemus/grpc,deepaklukose/grpc,kpayson64/grpc,stanley-cheung/grpc,muxi/grpc,thinkerou/grpc,Vizerai/grpc,mehrdada/grpc,jboeuf/grpc,chrisdunelm/grpc,geffzhang/grpc,grpc/grpc,grpc/grpc,grpc/grpc,ctiller/grpc,jboeuf/grpc,vjpai/grpc,Vizerai/grpc,donnadionne/grpc,ctiller/grpc,murgatroid99/grpc,carl-mastrangelo/grpc,jboeuf/grpc,ncteisen/grpc,chrisdunelm/grpc,deepaklukose/grpc,ejona86/grpc,mehrdada/grpc,daniel-j-born/grpc,muxi/grpc,carl-mastrangelo/grpc,ncteisen/grpc,fuchsia-mirror/third_party-grpc,jtattermusch/grpc,fuchsia-mirror/third_party-grpc