cmd/link, cmd/internal/obj: give Headtype a type

cmd/link, cmd/internal/obj: give Headtype a type

Separate out windows/windowsgui properly so we are not encoding some
of the Headtype value in a separate headstring global.

Remove one of the two copies of the variable from cmd/link.

Remove duplicate string to headtype list.

Change-Id: Ifa20fb9652a1dc95161e154aac11f15ad0f709d0
Reviewed-on: https://go-review.googlesource.com/28853
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>