avcodec: map PCX

Sample:
http://samples.mplayerhq.hu/image-samples/pcx/lena.pcxSigned-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/codec/avcodec/fourcc.c

@@ -162,7 +162,7 @@ static const struct
     { VLC_CODEC_VP6A, AV_CODEC_ID_VP6A, VIDEO_ES },
     { VLC_CODEC_AMV, AV_CODEC_ID_AMV, VIDEO_ES },
     /* AV_CODEC_ID_VB */
-    /* AV_CODEC_ID_PCX */
+    { VLC_CODEC_PCX, AV_CODEC_ID_PCX, VIDEO_ES },
     /* AV_CODEC_ID_SUNRAST */
     { VLC_CODEC_INDEO4, AV_CODEC_ID_INDEO4, VIDEO_ES },
     { VLC_CODEC_INDEO5, AV_CODEC_ID_INDEO5, VIDEO_ES },