LUA: remove unused catalog and DTD support
In my opinion, we do not want to encourage use of this. On the one hand, our libxml2 catalog support has never been thread-safe and this seems to have caused problems in the past (looking at the skins2 comments). On the other hand, the xtag plugin never implemented catalogs, so XML parsers have to handle unknown XML tags gracefully in any case. Also, shipping DTDs with VLC is awkward and arguably a waste of space.
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