Split TrueHD decoder from MLP

Originally committed as revision 18045 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/allcodecs.c

@@ -215,6 +215,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (SMACKAUD, smackaud);
     REGISTER_ENCDEC  (SONIC, sonic);
     REGISTER_ENCODER (SONIC_LS, sonic_ls);
+    REGISTER_DECODER (TRUEHD, truehd);
     REGISTER_DECODER (TRUESPEECH, truespeech);
     REGISTER_DECODER (TTA, tta);
     REGISTER_DECODER (VMDAUDIO, vmdaudio);