Update SincResampler with the latest Chromium code.

* Brings in on-the-fly sample ratio updates (or varispeed) with minor modifications to build in webrtc.
* Moved SSE and NEON optimized functions into their own files to handle run-time detection properly. NEON optimizations now enabled.

TESTED=unit tests and ran voe_cmd_test loopback with both devices using 44.1 kHz to exercise SincResampler in real-time.
R=dalecurtis@chromium.org, kma@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/1438004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3987 4adac7df-926f-26a2-2b94-8c16560cd09d
6 files changed