go/build: fix windows build by commenting out references to stdout and stderr in cgotest
go/build: fix windows build by commenting out references to stdout and stderr in cgotest

R=golang-dev, r, adg
CC=golang-dev
http://codereview.appspot.com/4561062
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go