libvpx: Add dependency on sse4 intrinsics library.

BUG=386801
TBR=tomfinegan@chromium.org

Review URL: https://codereview.chromium.org/343233003

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libvpx@278826 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
1 file changed