build: handle broken awk in version.bash
build: handle broken awk in version.bash

R=adg, rsc, ality
CC=golang-dev
http://codereview.appspot.com/4281069

Committer: Russ Cox <5ad239cb8a44f659eaaee0aa1ea5b94947abe557@golang.org>

tav/go,tav/go,tav/go,tav/go,tav/go,tav/go,tav/go