add missing wmapro decoder parts

Originally committed as revision 19752 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/allcodecs.c

@@ -232,6 +232,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (VMDAUDIO, vmdaudio);
     REGISTER_ENCDEC  (VORBIS, vorbis);
     REGISTER_DECODER (WAVPACK, wavpack);
+    REGISTER_DECODER (WMAPRO, wmapro);
     REGISTER_ENCDEC  (WMAV1, wmav1);
     REGISTER_ENCDEC  (WMAV2, wmav2);
     REGISTER_DECODER (WS_SND1, ws_snd1);