Merged r16456 into trunk branch.

Work-around missing librt for cross-compiling Chrome for Android in AOSP.

R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/23681006

git-svn-id: https://v8.googlecode.com/svn/trunk@16457 ce2b1a6d-e550-0410-aec6-3dcde31c8c00