Add support for AMR-WB encoding via libvo-amrwbenc

The wrapper code is based on the libamr wrapper removed in SVN rev 19365.

Signed-off-by: Martin Storsjö <martin@martin.st>

libavcodec/allcodecs.c

@@ -367,6 +367,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (LIBSPEEX, libspeex);
     REGISTER_ENCODER (LIBTHEORA, libtheora);
     REGISTER_ENCODER (LIBVO_AACENC, libvo_aacenc);
+    REGISTER_ENCODER (LIBVO_AMRWBENC, libvo_amrwbenc);
     REGISTER_ENCODER (LIBVORBIS, libvorbis);
     REGISTER_ENCDEC  (LIBVPX, libvpx);
     REGISTER_ENCODER (LIBX264, libx264);