This CL contains the same changes as in WebRTC revision
4957 and r4959. This will make the tests run properly
on the memcheck and tsan bots again.

TEST=compiled and successfully ran from the parent dir of trunk:
trunk/tools/valgrind-libyuv/libyuv_tests.sh --test libyuv_unittest --tool memcheck --target Release --build-dir trunk/out
TBR=fbarchard@google.com

Review URL: https://webrtc-codereview.appspot.com/4049004

git-svn-id: http://libyuv.googlecode.com/svn/trunk@860 16f28f9a-4ce2-e073-06de-1de4eb20be90