alacenc: last few hunks approved by michael

Originally committed as revision 14845 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/allcodecs.c

@@ -182,7 +182,7 @@ void avcodec_register_all(void)
 
     /* audio codecs */
     REGISTER_ENCDEC  (AC3, ac3);
-    REGISTER_DECODER (ALAC, alac);
+    REGISTER_ENCDEC  (ALAC, alac);
     REGISTER_DECODER (APE, ape);
     REGISTER_DECODER (ATRAC3, atrac3);
     REGISTER_DECODER (COOK, cook);