cmd/coordinator: disable netbsd builds for now

They're not working yet.

Updates golang/go#8643

Change-Id: I3b9b91bcd2071a59a232ea936d7e0495adecba9a
Reviewed-on: https://go-review.googlesource.com/21499
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
1 file changed