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 5442083b1c541dd166b3adf39131259fc846a62b by
Carl Eugen Hoyos. Fixes bug 393.
