Fixing wait3 + wait4 signature mismatch with bionic.
Fixing wait3 + wait4 signature mismatch with bionic.

Submitting TBR to green bots.

BUG=None
TEST=trybots
TBR=sbc@chromium.org

Review URL: https://codereview.chromium.org/649333003

dtkav/naclports,yeyus/naclports,yeyus/naclports,kuscsik/naclports,kuscsik/naclports,kuscsik/naclports,Schibum/naclports,Schibum/naclports,yeyus/naclports,Schibum/naclports,Schibum/naclports,Schibum/naclports,dtkav/naclports,kuscsik/naclports,yeyus/naclports,dtkav/naclports,Schibum/naclports,yeyus/naclports,dtkav/naclports,yeyus/naclports,kuscsik/naclports,dtkav/naclports