src: Make.pkg don't create $(TARGDIR) with goinstall.
src: Make.pkg don't create $(TARGDIR) with goinstall.

R=golang-dev, adg
CC=golang-dev
http://codereview.appspot.com/4548071

Committer: Andrew Gerrand <395a7d33bec8475c9b83b7d440f141bcbd994aa5@golang.org>
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go