avformat/riff: add C210 FourCC (Canopus C210)

libavformat/riff.c

@@ -248,6 +248,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
     { AV_CODEC_ID_R10K,         MKTAG('R', '1', '0', 'k') },
     { AV_CODEC_ID_R210,         MKTAG('r', '2', '1', '0') },
     { AV_CODEC_ID_V210,         MKTAG('v', '2', '1', '0') },
+    { AV_CODEC_ID_V210,         MKTAG('C', '2', '1', '0') },
     { AV_CODEC_ID_V308,         MKTAG('v', '3', '0', '8') },
     { AV_CODEC_ID_V408,         MKTAG('v', '4', '0', '8') },
     { AV_CODEC_ID_AYUV,         MKTAG('A', 'Y', 'U', 'V') },