Roll Opus with ARM optimizations enabled to WebRTC

This CL roll latest Opus changes from Chromium.

The major update is that optimizations are enabled for ARM processors.

BUG=
R=minyue@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/10599005

git-svn-id: http://webrtc.googlecode.com/svn/trunk@5777 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed