[Bug 221297] Crossbuidling of lang/go explicitly requires CGO_ENABLED=1

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221297

            Bug ID: 221297
           Summary: Crossbuidling of lang/go explicitly requires
                    CGO_ENABLED=1
           Product: Ports & Packages
           Version: Latest
          Hardware: arm
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: jlaffaye at FreeBSD.org
          Reporter: tagattie at yandex.com
                CC: freebsd-arm at FreeBSD.org
          Assignee: jlaffaye at FreeBSD.org
                CC: freebsd-arm at FreeBSD.org
             Flags: maintainer-feedback?(jlaffaye at FreeBSD.org)

Created attachment 185109
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=185109&action=edit
A patch for Makefile

Crossbuilding of lang/go (using Poudriere) ends up with the following error:
=======================<phase: package        >============================
===>  Building package for go-1.8.3,1
pkg-static: Unable to access file
/wrkdirs/usr/ports/lang/go/work/stage/usr/loca
l/go/pkg/freebsd_arm/runtime/cgo.a:No such file or directory
*** Error code 1

According to the Go source code at
https://github.com/golang/go/blob/master/src/go/build/build.go#L307, "cgo must
be explicitly enabled for cross compilation builds".

I tried attached the patch and crossbuilding succeeded without an error.
(GOARM=7 is to cope with the bug #205820)

I'm not sure how I can know host arch of crossbuilding (target arch is
${ARCH}), so I just simply put the line there, which should be better only when
crossbuilding.

Thanks,
Hiroki Tagato

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