Fix intermittent build failure in bash
Fix intermittent build failure in bash

This change works around a missing dependency in the
bash build system that was causing parallel builds
to occasionally fail.

R=binji@chromium.org

Review URL: https://codereview.chromium.org/969253003

yeyus/naclports,yeyus/naclports,yeyus/naclports,Schibum/naclports,yeyus/naclports,Schibum/naclports,Schibum/naclports,Schibum/naclports,Schibum/naclports,yeyus/naclports,yeyus/naclports,Schibum/naclports