This is needed due to changes in the way the trybots checkout the source code before applying the uploaded patch for a try job.

BUG=none
TEST=local master and submitted tryjob + verifying update step succeeded. Tryjob submitted to live try master with patch applying properly for all bots.
Review URL: https://webrtc-codereview.appspot.com/1059004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@546 16f28f9a-4ce2-e073-06de-1de4eb20be90