cmd/link: fix addition of -Wl,-z,relro
cmd/link: fix addition of -Wl,-z,relro

Not sure how I managed to do this, or get it past review.

Change-Id: I141b97ef8e09dcc9c910c45493a584a3dced2b28
Reviewed-on: https://go-review.googlesource.com/14634
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

dterei/go,deft-code/go,vanloswang/go,CarterTsai/go,derekmarcotte/go,suncycheng/go,josharian/go,linux-on-ibm-z/go,rachtsingh/gogojuice,josharian/go,ichu501/go,roth1002/go,akutz/go,miolini/go,momchil-velikov/go,jdhenke/go,Pulgafree/go,deft-code/go,Samurais/go,roth1002/go,beealone/go,jacobhaven/go,xiuzhifu/go,zhangg/go,golang/go,mwhudson/go,linux-on-ibm-z/go,alex-zhang/go,suncycheng/go,CarterTsai/go,cyberroadie/go,vanloswang/go,miolini/go,Endika/go,roth1002/go,kim-racktop/go,Cofyc/go,b54898533/go,miolini/go,samanalysis/go,Cofyc/go,GeorgiCodes/go,Jordanzuo/go,alex-zhang/go,beealone/go,vanloswang/go,GeorgiCodes/go,goodlang/good,derekmarcotte/go,Jordanzuo/go,samanalysis/go,Endika/go,ichu501/go,kim-racktop/go,odeke-em/go,b54898533/go,vanloswang/go,jdhenke/go,goodlang/good,4ad/go,ganboing/go-esx,golang/go,mwhudson/go,yasarkunduz/go,CAFxX/go,GeorgiCodes/go,vsekhar/elastic-go,likesea/go,momchil-velikov/go,josharian/go,theif519/go,roth1002/go,CAFxX/go,binarycrusader/go,cloudflare/go,jdhenke/go,ichu501/go,theif519/go,ichu501/go,Cofyc/go,Jordanzuo/go,goodlang/good,Endika/go,binarycrusader/go,Samurais/go,binarycrusader/go,dterei/go,beealone/go,derekmarcotte/go,jdhenke/go,cloudflare/go,jonasi/go,jacobsa/go,mikekap/go,stormltf/go,linux-on-ibm-z/go,rachtsingh/gogojuice,jdhenke/go,NunoEdgarGub1/go,linux-on-ibm-z/go,mwhudson/go,sndnvaps/go,vsekhar/elastic-go,theif519/go,zhangg/go,derekmarcotte/go,suncycheng/go,stormltf/go,mwhudson/go,b54898533/go,suncycheng/go,mwhudson/go,joshsammut/go,beealone/go,ImJasonH/go,Cofyc/go,miolini/go,ichu501/go,mwhudson/go,ImJasonH/go,b54898533/go,b54898533/go,ichu501/go,codestation/go,josharian/go,deft-code/go,suncycheng/go,polyverse-security/go,malvira/go,fjballest/golang,codestation/go,malvira/go,yasarkunduz/go,Jordanzuo/go,vsekhar/elastic-go,nawawi/go,alex-zhang/go,gdey/go,polyverse-security/go,nawawi/go,NunoEdgarGub1/go,jacobhaven/go,polyverse-security/go,vsekhar/elastic-go,joshsammut/go,zhangg/go,akutz/go,jonasi/go,odeke-em/go,rachtsingh/gogojuice,nawawi/go,golang/go,codestation/go,vsekhar/elastic-go,mikekap/go,akutz/go,mwhudson/go,fjballest/golang,fjballest/golang,zhangg/go,cookerzhu/go,ichu501/go,goodlang/good,alex-zhang/go,beealone/go,odeke-em/go,codestation/go,xiuzhifu/go,CAFxX/go,jacobhaven/go,binarycrusader/go,NunoEdgarGub1/go,ganboing/go-esx,mikekap/go,Samurais/go,Pulgafree/go,Pulgafree/go,gdey/go,CAFxX/go,cloudflare/go,CarterTsai/go,Endika/go,golang/go,Cofyc/go,akutz/go,roth1002/go,cookerzhu/go,cyberroadie/go,ganboing/go-esx,jacobsa/go,zhangg/go,codestation/go,malvira/go,cloudflare/go,GeorgiCodes/go,CarterTsai/go,dterei/go,likesea/go,roth1002/go,likesea/go,jacobhaven/go,cyberroadie/go,polyverse-security/go,theif519/go,GeorgiCodes/go,ImJasonH/go,4ad/go,xiuzhifu/go,gdey/go,fjballest/golang,gdey/go,Samurais/go,codestation/go,jonasi/go,binarycrusader/go,NunoEdgarGub1/go,mwhudson/go,ganboing/go-esx,likesea/go,joshsammut/go,dterei/go,Jordanzuo/go,theif519/go,alex-zhang/go,snowsnail/go,cloudflare/go,akutz/go,codestation/go,stormltf/go,suncycheng/go,golang/go,kim-racktop/go,xiuzhifu/go,malvira/go,josharian/go,yasarkunduz/go,malvira/go,ganboing/go-esx,deft-code/go,momchil-velikov/go,vanloswang/go,derekmarcotte/go,snowsnail/go,miolini/go,yasarkunduz/go,samanalysis/go,suncycheng/go,kim-racktop/go,josharian/go,nawawi/go,miolini/go,jacobsa/go,jacobsa/go,akutz/go,samanalysis/go,vsekhar/elastic-go,Cofyc/go,jacobsa/go,mikekap/go,xiuzhifu/go,NunoEdgarGub1/go,momchil-velikov/go,cyberroadie/go,ImJasonH/go,snowsnail/go,codestation/go,sndnvaps/go,josharian/go,stormltf/go,b54898533/go,rachtsingh/gogojuice,vanloswang/go,kim-racktop/go,gdey/go,ganboing/go-esx,linux-on-ibm-z/go,jacobsa/go,alex-zhang/go,CAFxX/go,Cofyc/go,mikekap/go,alex-zhang/go,jdhenke/go,likesea/go,cookerzhu/go,momchil-velikov/go,odeke-em/go,snowsnail/go,Jordanzuo/go,NunoEdgarGub1/go,goodlang/good,yasarkunduz/go,4ad/go,golang/go,akutz/go,Jordanzuo/go,stormltf/go,odeke-em/go,4ad/go,golang/go,cookerzhu/go,Samurais/go,kim-racktop/go,samanalysis/go,GeorgiCodes/go,4ad/go,cookerzhu/go,goodlang/good,binarycrusader/go,zhangg/go,beealone/go,likesea/go,odeke-em/go,CAFxX/go,josharian/go,CarterTsai/go,Jordanzuo/go,nawawi/go,CarterTsai/go,miolini/go,nawawi/go,sndnvaps/go,vanloswang/go,binarycrusader/go,ImJasonH/go,momchil-velikov/go,Pulgafree/go,Samurais/go,cookerzhu/go,nawawi/go,zhangg/go,mikekap/go,beealone/go,CAFxX/go,binarycrusader/go,theif519/go,Endika/go,roth1002/go,Endika/go,snowsnail/go,joshsammut/go,momchil-velikov/go,suncycheng/go,sndnvaps/go,snowsnail/go,cyberroadie/go,samanalysis/go,sndnvaps/go,cloudflare/go,Samurais/go,Pulgafree/go,theif519/go,4ad/go,cloudflare/go,stormltf/go,beealone/go,Samurais/go,jdhenke/go,jacobsa/go,xiuzhifu/go,zhangg/go,Cofyc/go,golang/go,NunoEdgarGub1/go,dterei/go,derekmarcotte/go,malvira/go,yasarkunduz/go,sndnvaps/go,nawawi/go,polyverse-security/go,CAFxX/go,b54898533/go,jacobhaven/go,odeke-em/go,Pulgafree/go,derekmarcotte/go,rachtsingh/gogojuice,christopher-henderson/Go,kim-racktop/go,ImJasonH/go,stormltf/go,deft-code/go,deft-code/go,rachtsingh/gogojuice,CarterTsai/go,jonasi/go,joshsammut/go,cyberroadie/go,likesea/go,linux-on-ibm-z/go,ganboing/go-esx,likesea/go,samanalysis/go,derekmarcotte/go,ichu501/go,ImJasonH/go,malvira/go,Endika/go,rachtsingh/gogojuice,joshsammut/go,fjballest/golang,joshsammut/go,jonasi/go,Pulgafree/go,snowsnail/go,vanloswang/go,deft-code/go,cloudflare/go,cyberroadie/go,dterei/go,NunoEdgarGub1/go,dterei/go,ImJasonH/go,momchil-velikov/go,linux-on-ibm-z/go,kim-racktop/go,sndnvaps/go,yasarkunduz/go,malvira/go,samanalysis/go,GeorgiCodes/go,yasarkunduz/go,GeorgiCodes/go,dterei/go,snowsnail/go,sndnvaps/go,jdhenke/go,mikekap/go,Pulgafree/go,mikekap/go,jacobhaven/go,miolini/go,cookerzhu/go,joshsammut/go,vsekhar/elastic-go,jacobsa/go,jonasi/go,gdey/go,gdey/go,rachtsingh/gogojuice,theif519/go,xiuzhifu/go,akutz/go,4ad/go,Endika/go,cookerzhu/go,cyberroadie/go,CarterTsai/go,ganboing/go-esx,jonasi/go,jacobhaven/go,goodlang/good,fjballest/golang,polyverse-security/go,4ad/go,jacobhaven/go,jonasi/go,linux-on-ibm-z/go,fjballest/golang,xiuzhifu/go,polyverse-security/go,odeke-em/go,alex-zhang/go,goodlang/good,polyverse-security/go,vsekhar/elastic-go,stormltf/go,deft-code/go,roth1002/go,fjballest/golang,gdey/go,b54898533/go