cmd/dist: allow gohostarch to be s390x
cmd/dist: allow gohostarch to be s390x

Should let the s390x builder progress a little further.

Change-Id: I5eab5f384b0b039f8e246ba69ecfb24de08625d2
Reviewed-on: https://go-review.googlesource.com/20965
Reviewed-by: Minux Ma <72d850dbd8858b791995463d8539b5a379577f28@golang.org>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
Run-TryBot: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

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