Adding Cinepak encoder

With permission of Tomas Härdin applied by Rl aetey.se

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/allcodecs.c

@@ -122,7 +122,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER(CAVS,              cavs);
     REGISTER_DECODER(CDGRAPHICS,        cdgraphics);
     REGISTER_DECODER(CDXL,              cdxl);
-    REGISTER_DECODER(CINEPAK,           cinepak);
+    REGISTER_ENCDEC (CINEPAK,           cinepak);
     REGISTER_ENCDEC (CLJR,              cljr);
     REGISTER_DECODER(CLLC,              cllc);
     REGISTER_ENCDEC (COMFORTNOISE,      comfortnoise);