Define AVMediaType enum, and use it instead of enum CodecType, which

is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/mimic.c

@@ -380,7 +380,7 @@ static av_cold int mimic_decode_end(AVCodecContext *avctx)
 
 AVCodec mimic_decoder = {
     "mimic",
-    CODEC_TYPE_VIDEO,
+    AVMEDIA_TYPE_VIDEO,
     CODEC_ID_MIMIC,
     sizeof(MimicContext),
     mimic_decode_init,