libnativehelper exports headers under nativehelper. These were available before incorrectly as global headers in order to give access to jni.h. Test: SurfaceTexture.cpp finds headers Bug: 63762847 Change-Id: I3ec1b888c226c2894649d9f9a8f8203891c1ab02 (cherry picked from commit 849252c469396a759c394dc6382470a6a07d6587)