[Bug 225812] Mk/Uses/go.mk: Add GO_BUILDFLAGS variable

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225812

            Bug ID: 225812
           Summary: Mk/Uses/go.mk: Add GO_BUILDFLAGS variable
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: dor.bsd at xm0.uk
                CC: freebsd-ports-bugs at FreeBSD.org

Created attachment 190491
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=190491&action=edit
go.mk GO_BUILDFLAGS diff

This diff adds a `GO_BUILDFLAGS` variable to `Mk/Uses/go.mk` for passing
additional build flags (go help build) to the `go install` command.

I'm proposing this change since while working on Prometheus and its exporters,
I've found myself copying the default Go `do-build` to enable passing of extra
`-ldflags` to `go install`. Other arbitrary flags are also passable via this
variable.

Note that these flags and arguments are different from the flags we can already
pass in via `CGO_LDFLAGS` and `CGO_CFLAGS`.

-David

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