Disable libxkbfile on mac (libx11 not yet building).
Disable libxkbfile on mac (libx11 not yet building).

TBR=bradnelson@chromium.org

Review URL: https://codereview.chromium.org/439923004

git-svn-id: 84b3587ce119b778414dcb50e18b7479aacf4f1d@1513 7dad1e8b-422e-d2af-fbf5-8013b78bd812

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