Remove opus include path from opus.gypi.

It's now exported by opus.gyp.

Review URL: https://webrtc-codereview.appspot.com/928007

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@2997 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed