cmd/link/internal/ld: don't link with -no_pie on darwin/arm64
cmd/link/internal/ld: don't link with -no_pie on darwin/arm64

Ever since CL 33301 linking darwin/arm64 excutables has resulted in
warnings like:

ld: warning: -no_pie ignored for arm64

Remove -no_pie on darwin/arm64.

Change-Id: I9f7685351fa8cce29795283e1a24fc7a6753d698
Reviewed-on: https://go-review.googlesource.com/42815
Run-TryBot: Elias Naur <993af7099cb24ce1a88d64108ae1e8b0385f2fc0@gmail.com>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

codestation/go,ImJasonH/go,akutz/go,cloudflare/go,golang/go,vsekhar/elastic-go,codestation/go,codestation/go,Cofyc/go,akutz/go,vsekhar/elastic-go,cloudflare/go,CAFxX/go,ImJasonH/go,CAFxX/go,cloudflare/go,codestation/go,ImJasonH/go,derekmarcotte/go,codestation/go,golang/go,akutz/go,akutz/go,vsekhar/elastic-go,polyverse-security/go,codestation/go,golang/go,derekmarcotte/go,CAFxX/go,akutz/go,akutz/go,polyverse-security/go,Cofyc/go,Cofyc/go,CAFxX/go,josharian/go,nawawi/go,CAFxX/go,polyverse-security/go,Cofyc/go,Cofyc/go,golang/go,christopher-henderson/Go,vsekhar/elastic-go,josharian/go,derekmarcotte/go,polyverse-security/go,josharian/go,codestation/go,golang/go,nawawi/go,nawawi/go,derekmarcotte/go,Cofyc/go,nawawi/go,ImJasonH/go,nawawi/go,polyverse-security/go,codestation/go,cloudflare/go,derekmarcotte/go,Cofyc/go,vsekhar/elastic-go,josharian/go,CAFxX/go,CAFxX/go,ImJasonH/go,polyverse-security/go,cloudflare/go,nawawi/go,golang/go,Cofyc/go,cloudflare/go,cloudflare/go,cloudflare/go,CAFxX/go,ImJasonH/go,ImJasonH/go,derekmarcotte/go,nawawi/go,akutz/go,josharian/go,josharian/go,vsekhar/elastic-go,golang/go,polyverse-security/go,akutz/go,vsekhar/elastic-go,josharian/go,nawawi/go,derekmarcotte/go,vsekhar/elastic-go,polyverse-security/go,derekmarcotte/go,ImJasonH/go,josharian/go,golang/go