Musepack SV8 demuxer and decoder

Originally committed as revision 10938 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/allcodecs.c

@@ -187,6 +187,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (MP3ADU, mp3adu);
     REGISTER_DECODER (MP3ON4, mp3on4);
     REGISTER_DECODER (MPC7, mpc7);
+    REGISTER_DECODER (MPC8, mpc8);
     REGISTER_DECODER (NELLYMOSER, nellymoser);
     REGISTER_DECODER (QDM2, qdm2);
     REGISTER_DECODER (RA_144, ra_144);