SIPR decoder for modes 8k5, 6k5 and 5k0.

Patch by Vladimir Voroshilov and myself.

Originally committed as revision 21125 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/allcodecs.c

@@ -232,6 +232,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (RA_144, ra_144);
     REGISTER_DECODER (RA_288, ra_288);
     REGISTER_DECODER (SHORTEN, shorten);
+    REGISTER_DECODER (SIPR, sipr);
     REGISTER_DECODER (SMACKAUD, smackaud);
     REGISTER_ENCDEC  (SONIC, sonic);
     REGISTER_ENCODER (SONIC_LS, sonic_ls);