Add Pictor/PC Paint to image2 muxer/demuxer

Originally committed as revision 23533 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/img2.c

@@ -73,6 +73,7 @@ static const IdStrMap img_tags[] = {
     { CODEC_ID_SUNRAST   , "sunras"},
     { CODEC_ID_JPEG2000  , "jp2"},
     { CODEC_ID_DPX       , "dpx"},
+    { CODEC_ID_PICTOR    , "pic"},
     { CODEC_ID_NONE      , NULL}
 };