cmd/internal/sys: add support for GOARCH=mips{,le}
cmd/internal/sys: add support for GOARCH=mips{,le}

Change-Id: I8c6b8839c68818430510702719dca15b8d748fb8
Reviewed-on: https://go-review.googlesource.com/31473
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>

vsekhar/elastic-go,suncycheng/go,goodlang/good,linux-on-ibm-z/go,polyverse-security/go,josharian/go,CAFxX/go,ImJasonH/go,cloudflare/go,akutz/go,goodlang/good,suncycheng/go,linux-on-ibm-z/go,suncycheng/go,goodlang/good,nawawi/go,linux-on-ibm-z/go,suncycheng/go,golang/go,nawawi/go,nawawi/go,goodlang/good,christopher-henderson/Go,josharian/go,golang/go,Cofyc/go,akutz/go,nawawi/go,codestation/go,CAFxX/go,josharian/go,vsekhar/elastic-go,codestation/go,derekmarcotte/go,cloudflare/go,Cofyc/go,ImJasonH/go,Cofyc/go,polyverse-security/go,polyverse-security/go,akutz/go,cloudflare/go,derekmarcotte/go,vsekhar/elastic-go,vsekhar/elastic-go,derekmarcotte/go,josharian/go,cloudflare/go,codestation/go,akutz/go,akutz/go,vsekhar/elastic-go,goodlang/good,akutz/go,CAFxX/go,polyverse-security/go,linux-on-ibm-z/go,golang/go,goodlang/good,ImJasonH/go,derekmarcotte/go,CAFxX/go,Cofyc/go,Cofyc/go,ImJasonH/go,ImJasonH/go,cloudflare/go,codestation/go,polyverse-security/go,linux-on-ibm-z/go,derekmarcotte/go,CAFxX/go,akutz/go,josharian/go,nawawi/go,codestation/go,nawawi/go,Cofyc/go,cloudflare/go,suncycheng/go,suncycheng/go,codestation/go,vsekhar/elastic-go,golang/go,josharian/go,akutz/go,CAFxX/go,polyverse-security/go,golang/go,cloudflare/go,codestation/go,derekmarcotte/go,ImJasonH/go,suncycheng/go,polyverse-security/go,nawawi/go,Cofyc/go,derekmarcotte/go,suncycheng/go,CAFxX/go,polyverse-security/go,golang/go,linux-on-ibm-z/go,nawawi/go,golang/go,CAFxX/go,golang/go,linux-on-ibm-z/go,goodlang/good,ImJasonH/go,cloudflare/go,vsekhar/elastic-go,josharian/go,Cofyc/go,codestation/go,vsekhar/elastic-go,goodlang/good,derekmarcotte/go,josharian/go,ImJasonH/go,linux-on-ibm-z/go