build/env/netbsd-amd64: add Makefile

Change-Id: If1d3079a4285ead907d96349a39d1d2390ddab2e
Reviewed-on: https://go-review.googlesource.com/35127
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed