Use cpu_features library from ndk when built with chromium.

In Chromium on Andorid, nkd provides cpu_features library so that all modules using that library can link against it to avoid function re-definition.
Review URL: https://webrtc-codereview.appspot.com/937024

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@3127 4adac7df-926f-26a2-2b94-8c16560cd09d
2 files changed