Fix the Android compilation (better structure for NetEq test libs)

This change should make the Android targets compile again. The reason
for the failure was a highly dubious structure in the gypi files. With
this fix, the structure is somewhat cleaner. Still room for improvement.

BUG=3254
TBR=andrew@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/15369004

git-svn-id: http://webrtc.googlecode.com/svn/trunk/webrtc@5972 4adac7df-926f-26a2-2b94-8c16560cd09d
3 files changed