description: Remove an uninvited NULL check.

This check rejected adding any sample description when File Type Box is
absent.
brand: Check more 3GPP profiles for compatibilities.
muxer: Add 'dby1' brand when adding any Dolby Audio stream.
brand: Forbid to use track reference for 3GPP Basic Profiles.
brand: Clear flags for compatibility before checking compatibilities.
brand: Disallow some ver.1 boxes when compatible with QTFF or iTunes MP4.

It seems some ver.1 box is unrecognized or undefined in those file format.
We don't use ver.1 for those boxes when muxing a file compatible with QTFF
or iTunes MP4 so that avoid any trouble.
Fix typo of the entry of lsmash_summary_type which indicates an unknown.