arm: fic build3, disable flaky 64 bit test
arm: fic build3, disable flaky 64 bit test

R=rsc
CC=golang-dev
http://codereview.appspot.com/1888041
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go