net: add -lsendfile to cgo LDFLAGS for solaris
net: add -lsendfile to cgo LDFLAGS for solaris

Fixes external linking of net/http tests (or anything that uses
sendfile).

Fixes #12390.

Change-Id: Iee08998cf66e7b0ce851db138a00ebae6dc2395e
Reviewed-on: https://go-review.googlesource.com/14072
Reviewed-by: Dave Cheney <bfcdf3e6ca6cef45543bfbb57509c92aec9a39fb@cheney.net>
Reviewed-by: Aram Hăvărneanu <947f6c13826812af1df6a3fba06092a9b6c6b082@mgk.ro>

jacobhaven/go,ganboing/go-esx,vishsingh/go,CAFxX/go,4ad/go,joshsammut/go,mdp/go,xujianhai/go,mikekap/go,greyhwndz/go,theif519/go,deft-code/go,ganboing/go-esx,ObjectiveJoe/go,qskycolor/go,mikekap/go,ganboing/go-esx,Jordanzuo/go,danielsoro/go,sinuos/go,snowsnail/go,xujianhai/go,Cofyc/go,Young55555/go,linux-on-ibm-z/go,CAFxX/go,theif519/go,famorted/go,arschles/golang-go,jonasi/go,CarterTsai/go,CarterTsai/go,zhangg/go,slavau/go,kakuhiroshi/go,Pulgafree/go,yangzhongj/go,mwhudson/go,greyhwndz/go,theif519/go,albertjin/golang-go,mgyenik/go,jonahglover/go,cyberroadie/go,golang/go,ifagnosticism/go,samanalysis/go,gdey/go,likesea/go,codestation/go,snowsnail/go,golang/go,likesea/go,rachtsingh/gogojuice,cookerzhu/go,kim-racktop/go,chinanjjohn2012/go,jefby/go,greyhwndz/go,kim-racktop/go,4ad/go,devpadawan/go,albertjin/golang-go,famorted/go,malvira/go,GeorgiCodes/go,NunoEdgarGub1/go,Jordanzuo/go,honsiorovskyi/go,greyhwndz/go,vsdutka/go,devpadawan/go,CAFxX/go,jdhenke/go,WIZARD-CXY/go,cyberroadie/go,CiscoCloud/go,nawawi/go,goodlang/good,Badredapple/go,mdp/go,beealone/go,ichu501/go,jdhenke/go,CarterTsai/go,theass/go,Cofyc/go,deft-code/go,albertjin/golang-go,polyverse-security/go,xiuzhifu/go,ImJasonH/go,polyverse-security/go,suncycheng/go,fjballest/golang,beealone/go,yangzhongj/go,yasarkunduz/go,Jordanzuo/go,mwhudson/go,theif519/go,Cofyc/go,qskycolor/go,jonasi/go,odeke-em/go,vsdutka/go,AALEKH/go,jonahglover/go,beealone/go,jacobhaven/go,polyverse-security/go,greyhwndz/go,gdey/go,zhangg/go,joshsammut/go,josharian/go,vsekhar/elastic-go,yangzhongj/go,qskycolor/go,Samurais/go,vanloswang/go,cyberroadie/go,CiscoCloud/go,skatsuta/go,ObjectiveJoe/go,jonasi/go,gdey/go,AALEKH/go,jacobsa/go,goodlang/good,binarycrusader/go,binarycrusader/go,Young55555/go,nawawi/go,malvira/go,nawawi/go,kakuhiroshi/go,goodlang/good,mdp/go,goodlang/good,binarycrusader/go,xujianhai/go,Pulgafree/go,ganboing/go-esx,malvira/go,WIZARD-CXY/go,vanloswang/go,josharian/go,AALEKH/go,josharian/go,vishsingh/go,AALEKH/go,vishsingh/go,beealone/go,gdey/go,akutz/go,codestation/go,malvira/go,theif519/go,devpadawan/go,suncycheng/go,joshsammut/go,jonahglover/go,vsekhar/elastic-go,slavau/go,Young55555/go,xiuzhifu/go,WIZARD-CXY/go,NunoEdgarGub1/go,dterei/go,jonasi/go,Samurais/go,GeorgiCodes/go,vsdutka/go,stormltf/go,WIZARD-CXY/go,danielsoro/go,ImJasonH/go,CiscoCloud/go,theass/go,dterei/go,Endika/go,ichu501/go,rentongzhang/go,vanloswang/go,famorted/go,yasarkunduz/go,jacobsa/go,ganboing/go-esx,mdp/go,momchil-velikov/go,cyberroadie/go,jacobsa/go,deft-code/go,zhangg/go,sndnvaps/go,likesea/go,CiscoCloud/go,mwhudson/go,b54898533/go,mgyenik/go,odeke-em/go,roth1002/go,Young55555/go,mikekap/go,fjballest/golang,sinuos/go,roth1002/go,theif519/go,xujianhai/go,cloudflare/go,xujianhai/go,linux-on-ibm-z/go,NunoEdgarGub1/go,Jordanzuo/go,momchil-velikov/go,ericsnowcurrently/go,Jordanzuo/go,kakuhiroshi/go,rentongzhang/go,CarterTsai/go,Badredapple/go,momchil-velikov/go,snowsnail/go,famorted/go,xiuzhifu/go,jdhenke/go,famorted/go,malvira/go,yasarkunduz/go,suncycheng/go,greyhwndz/go,jefby/go,vishsingh/go,roth1002/go,snowsnail/go,mgyenik/go,AALEKH/go,WIZARD-CXY/go,fjballest/golang,snowsnail/go,ImJasonH/go,dpatel06/go,skatsuta/go,devpadawan/go,kakuhiroshi/go,ifagnosticism/go,cloudflare/go,myPublicGit/go,ObjectiveJoe/go,rachtsingh/gogojuice,Young55555/go,4ad/go,cloudflare/go,slavau/go,nawawi/go,polyverse-security/go,rentongzhang/go,cloudflare/go,jacobsa/go,roth1002/go,albertjin/golang-go,kim-racktop/go,jdhenke/go,slavau/go,qskycolor/go,deft-code/go,dterei/go,joshsammut/go,ObjectiveJoe/go,vsdutka/go,sndnvaps/go,likesea/go,honsiorovskyi/go,jonahglover/go,vsdutka/go,vsdutka/go,deft-code/go,dpatel06/go,CiscoCloud/go,miolini/go,jdhenke/go,cyberroadie/go,myPublicGit/go,sinuos/go,slavau/go,b54898533/go,danielsoro/go,alex-zhang/go,cyberroadie/go,dpatel06/go,yasarkunduz/go,golang/go,Endika/go,samanalysis/go,arschles/golang-go,rachtsingh/gogojuice,b54898533/go,suncycheng/go,Cofyc/go,skatsuta/go,AALEKH/go,roth1002/go,Samurais/go,sinuos/go,arschles/golang-go,jefby/go,famorted/go,arschles/go-1,linux-on-ibm-z/go,Pulgafree/go,vanloswang/go,rentongzhang/go,nawawi/go,danielsoro/go,b54898533/go,odeke-em/go,derekmarcotte/go,akutz/go,linux-on-ibm-z/go,ganboing/go-esx,vishsingh/go,miolini/go,jacobhaven/go,zhangg/go,mikekap/go,qskycolor/go,slavau/go,cyberroadie/go,dterei/go,arschles/go-1,dpatel06/go,codestation/go,ichu501/go,ifagnosticism/go,jefby/go,mdp/go,chinanjjohn2012/go,CiscoCloud/go,malvira/go,chinanjjohn2012/go,binarycrusader/go,theif519/go,xujianhai/go,joshsammut/go,beealone/go,vsekhar/elastic-go,vanloswang/go,qskycolor/go,odeke-em/go,cookerzhu/go,nawawi/go,chinanjjohn2012/go,mikekap/go,rachtsingh/gogojuice,arschles/go-1,GeorgiCodes/go,theass/go,ImJasonH/go,ichu501/go,arschles/golang-go,momchil-velikov/go,ericsnowcurrently/go,theass/go,fjballest/golang,xiuzhifu/go,xiuzhifu/go,golang/go,skatsuta/go,Badredapple/go,arschles/golang-go,honsiorovskyi/go,b54898533/go,roth1002/go,kakuhiroshi/go,AALEKH/go,zhangg/go,derekmarcotte/go,ichu501/go,samanalysis/go,mwhudson/go,WIZARD-CXY/go,snowsnail/go,jacobsa/go,derekmarcotte/go,odeke-em/go,chinanjjohn2012/go,cloudflare/go,albertjin/golang-go,albertjin/golang-go,skatsuta/go,sndnvaps/go,ericsnowcurrently/go,jonahglover/go,cookerzhu/go,deft-code/go,yangzhongj/go,jefby/go,vanloswang/go,jacobhaven/go,dterei/go,ericsnowcurrently/go,polyverse-security/go,ifagnosticism/go,goodlang/good,ifagnosticism/go,GeorgiCodes/go,slavau/go,theass/go,Badredapple/go,goodlang/good,NunoEdgarGub1/go,alex-zhang/go,fjballest/golang,goodlang/good,CAFxX/go,Cofyc/go,ImJasonH/go,yasarkunduz/go,jefby/go,josharian/go,stormltf/go,chinanjjohn2012/go,mdp/go,jonasi/go,yangzhongj/go,stormltf/go,Badredapple/go,devpadawan/go,linux-on-ibm-z/go,akutz/go,b54898533/go,suncycheng/go,dterei/go,sinuos/go,arschles/go-1,albertjin/golang-go,kim-racktop/go,rachtsingh/gogojuice,beealone/go,ichu501/go,vsekhar/elastic-go,jonasi/go,rachtsingh/gogojuice,jonahglover/go,ObjectiveJoe/go,jacobsa/go,gdey/go,golang/go,polyverse-security/go,ichu501/go,theass/go,jacobhaven/go,myPublicGit/go,Endika/go,qskycolor/go,qskycolor/go,ObjectiveJoe/go,cloudflare/go,kim-racktop/go,vishsingh/go,Pulgafree/go,sinuos/go,stormltf/go,arschles/go-1,mikekap/go,ImJasonH/go,josharian/go,chinanjjohn2012/go,sndnvaps/go,kakuhiroshi/go,suncycheng/go,CarterTsai/go,roth1002/go,vsekhar/elastic-go,jacobhaven/go,Endika/go,samanalysis/go,jonasi/go,roth1002/go,polyverse-security/go,mdp/go,derekmarcotte/go,zhangg/go,beealone/go,Badredapple/go,miolini/go,deft-code/go,akutz/go,akutz/go,yangzhongj/go,mikekap/go,xujianhai/go,sndnvaps/go,mwhudson/go,kakuhiroshi/go,cookerzhu/go,NunoEdgarGub1/go,WIZARD-CXY/go,suncycheng/go,ImJasonH/go,rentongzhang/go,cookerzhu/go,ericsnowcurrently/go,myPublicGit/go,zhangg/go,Jordanzuo/go,4ad/go,alex-zhang/go,gdey/go,rachtsingh/gogojuice,codestation/go,golang/go,miolini/go,derekmarcotte/go,mdp/go,ObjectiveJoe/go,Badredapple/go,rachtsingh/gogojuice,likesea/go,dterei/go,dpatel06/go,jdhenke/go,vsekhar/elastic-go,jacobsa/go,GeorgiCodes/go,fjballest/golang,deft-code/go,golang/go,greyhwndz/go,vishsingh/go,Pulgafree/go,mgyenik/go,nawawi/go,ericsnowcurrently/go,Cofyc/go,alex-zhang/go,christopher-henderson/Go,Pulgafree/go,4ad/go,malvira/go,fjballest/golang,stormltf/go,chinanjjohn2012/go,ifagnosticism/go,CiscoCloud/go,likesea/go,honsiorovskyi/go,mwhudson/go,skatsuta/go,honsiorovskyi/go,Samurais/go,devpadawan/go,vsdutka/go,Endika/go,cookerzhu/go,suncycheng/go,yangzhongj/go,Endika/go,alex-zhang/go,Samurais/go,Cofyc/go,Young55555/go,yasarkunduz/go,theass/go,samanalysis/go,momchil-velikov/go,vanloswang/go,Cofyc/go,kim-racktop/go,ganboing/go-esx,kakuhiroshi/go,joshsammut/go,honsiorovskyi/go,danielsoro/go,danielsoro/go,akutz/go,momchil-velikov/go,Pulgafree/go,danielsoro/go,miolini/go,derekmarcotte/go,NunoEdgarGub1/go,famorted/go,honsiorovskyi/go,likesea/go,dpatel06/go,codestation/go,theif519/go,cookerzhu/go,samanalysis/go,codestation/go,likesea/go,CAFxX/go,4ad/go,snowsnail/go,dpatel06/go,ifagnosticism/go,yangzhongj/go,akutz/go,beealone/go,xujianhai/go,kim-racktop/go,dterei/go,jefby/go,Badredapple/go,sinuos/go,CarterTsai/go,sndnvaps/go,odeke-em/go,gdey/go,jacobsa/go,ericsnowcurrently/go,codestation/go,NunoEdgarGub1/go,GeorgiCodes/go,WIZARD-CXY/go,AALEKH/go,vsekhar/elastic-go,stormltf/go,b54898533/go,jonasi/go,akutz/go,sndnvaps/go,4ad/go,CarterTsai/go,CAFxX/go,cyberroadie/go,myPublicGit/go,NunoEdgarGub1/go,danielsoro/go,sinuos/go,mgyenik/go,rentongzhang/go,vsdutka/go,joshsammut/go,xiuzhifu/go,arschles/golang-go,zhangg/go,josharian/go,binarycrusader/go,cookerzhu/go,alex-zhang/go,malvira/go,b54898533/go,Jordanzuo/go,derekmarcotte/go,rentongzhang/go,snowsnail/go,odeke-em/go,nawawi/go,miolini/go,stormltf/go,Samurais/go,dpatel06/go,skatsuta/go,mgyenik/go,ObjectiveJoe/go,CAFxX/go,ganboing/go-esx,odeke-em/go,CAFxX/go,linux-on-ibm-z/go,miolini/go,ichu501/go,goodlang/good,joshsammut/go,binarycrusader/go,gdey/go,devpadawan/go,mgyenik/go,josharian/go,rentongzhang/go,jefby/go,momchil-velikov/go,Samurais/go,codestation/go,yasarkunduz/go,samanalysis/go,devpadawan/go,binarycrusader/go,linux-on-ibm-z/go,binarycrusader/go,golang/go,jacobhaven/go,Endika/go,stormltf/go,momchil-velikov/go,myPublicGit/go,arschles/go-1,vsekhar/elastic-go,CarterTsai/go,arschles/golang-go,kim-racktop/go,alex-zhang/go,xiuzhifu/go,jonahglover/go,theass/go,vanloswang/go,arschles/go-1,sndnvaps/go,Pulgafree/go,albertjin/golang-go,mgyenik/go,myPublicGit/go,Jordanzuo/go,GeorgiCodes/go,fjballest/golang,ImJasonH/go,Young55555/go,Young55555/go,myPublicGit/go,arschles/golang-go,4ad/go,jacobhaven/go,ifagnosticism/go,linux-on-ibm-z/go,Samurais/go,arschles/go-1,derekmarcotte/go,famorted/go,mwhudson/go,jdhenke/go,mwhudson/go,samanalysis/go,jonahglover/go,mikekap/go,honsiorovskyi/go,jdhenke/go,GeorgiCodes/go,josharian/go,greyhwndz/go,miolini/go,skatsuta/go,cloudflare/go,xiuzhifu/go,Endika/go,polyverse-security/go,alex-zhang/go,cloudflare/go,ericsnowcurrently/go,CiscoCloud/go,slavau/go,yasarkunduz/go,vishsingh/go