Remove include_dirs from voice_engine.gyp.

BUG=1662
R=xians@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/2193004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@4716 4adac7df-926f-26a2-2b94-8c16560cd09d
1 file changed