mov: handle h263 and flv1 for codec_tag 'H','2','6','3'
The sample in https://bugzilla.libav.org/show_bug.cgi?id=393 and samples/F4V/H263_NM_f.mp4 both have codec_tag H263 for different codecs. H263 is apparently used by Flash Media Server for Sorensen Spark videos. Patch based on commit 5442083b by Carl Eugen Hoyos. Fixes bug 393.
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