cmd/internal/obj: remove unused obj.Linksymfmt
cmd/internal/obj: remove unused obj.Linksymfmt

obj.Linksymfmt is no longer referenced by any packages in cmd/...

Change-Id: Id4d9213d1577e13580b60755dbf7da313b17cb0e
Reviewed-on: https://go-review.googlesource.com/41171
Run-TryBot: Dave Cheney <bfcdf3e6ca6cef45543bfbb57509c92aec9a39fb@cheney.net>
Reviewed-by: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>
TryBot-Result: Gobot Gobot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>

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