cmd/go: don't set GO15VENDOREXPERIMENT in TestSymlinksVendor
cmd/go: don't set GO15VENDOREXPERIMENT in TestSymlinksVendor

Change-Id: I14947b64bdafd975bf3915eceb07f98897304a85
Reviewed-on: https://go-review.googlesource.com/19708
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

golang/go,Cofyc/go,cloudflare/go,vanloswang/go,binarycrusader/go,vanloswang/go,josharian/go,4ad/go,vsekhar/elastic-go,ImJasonH/go,cloudflare/go,ganboing/go-esx,Samurais/go,theif519/go,miolini/go,golang/go,golang/go,Cofyc/go,golang/go,CAFxX/go,ganboing/go-esx,ganboing/go-esx,4ad/go,ImJasonH/go,vsekhar/elastic-go,suncycheng/go,Cofyc/go,CAFxX/go,goodlang/good,Cofyc/go,linux-on-ibm-z/go,suncycheng/go,vsekhar/elastic-go,Samurais/go,vsekhar/elastic-go,CAFxX/go,vsekhar/elastic-go,goodlang/good,suncycheng/go,golang/go,momchil-velikov/go,codestation/go,cloudflare/go,ImJasonH/go,vanloswang/go,nawawi/go,ImJasonH/go,theif519/go,binarycrusader/go,4ad/go,ganboing/go-esx,momchil-velikov/go,golang/go,christopher-henderson/Go,binarycrusader/go,momchil-velikov/go,momchil-velikov/go,golang/go,nawawi/go,miolini/go,vsekhar/elastic-go,akutz/go,derekmarcotte/go,cloudflare/go,Cofyc/go,miolini/go,akutz/go,goodlang/good,CAFxX/go,cloudflare/go,binarycrusader/go,momchil-velikov/go,josharian/go,suncycheng/go,4ad/go,nawawi/go,polyverse-security/go,linux-on-ibm-z/go,binarycrusader/go,linux-on-ibm-z/go,4ad/go,golang/go,akutz/go,ImJasonH/go,akutz/go,vanloswang/go,goodlang/good,josharian/go,codestation/go,codestation/go,polyverse-security/go,momchil-velikov/go,Samurais/go,Samurais/go,ImJasonH/go,polyverse-security/go,derekmarcotte/go,nawawi/go,Cofyc/go,vanloswang/go,cloudflare/go,goodlang/good,mwhudson/go,binarycrusader/go,theif519/go,miolini/go,derekmarcotte/go,theif519/go,momchil-velikov/go,vsekhar/elastic-go,miolini/go,derekmarcotte/go,ganboing/go-esx,codestation/go,miolini/go,codestation/go,linux-on-ibm-z/go,CAFxX/go,nawawi/go,ganboing/go-esx,goodlang/good,goodlang/good,binarycrusader/go,akutz/go,nawawi/go,derekmarcotte/go,josharian/go,ImJasonH/go,josharian/go,josharian/go,CAFxX/go,4ad/go,akutz/go,mwhudson/go,vsekhar/elastic-go,theif519/go,Samurais/go,suncycheng/go,suncycheng/go,derekmarcotte/go,polyverse-security/go,akutz/go,ImJasonH/go,theif519/go,mwhudson/go,ganboing/go-esx,polyverse-security/go,derekmarcotte/go,CAFxX/go,momchil-velikov/go,josharian/go,mwhudson/go,binarycrusader/go,suncycheng/go,vanloswang/go,miolini/go,Samurais/go,codestation/go,akutz/go,suncycheng/go,vanloswang/go,polyverse-security/go,Cofyc/go,mwhudson/go,mwhudson/go,linux-on-ibm-z/go,josharian/go,Cofyc/go,cloudflare/go,linux-on-ibm-z/go,vanloswang/go,CAFxX/go,Samurais/go,polyverse-security/go,codestation/go,mwhudson/go,Samurais/go,mwhudson/go,cloudflare/go,theif519/go,linux-on-ibm-z/go,theif519/go,nawawi/go,nawawi/go,miolini/go,goodlang/good,linux-on-ibm-z/go,codestation/go,4ad/go,derekmarcotte/go,ganboing/go-esx,polyverse-security/go,4ad/go