Deleted the unneeded copies of Lua

... so I could track more easily the next Lua release. Moreover, it was
pointless to keep all those copies around.

But I'm increasingly thinking of using lua.c *directly*, that is, use it as a
main file, remove the options I don't like and do the stuff I want. I could then
go hack the parser to my taste. That also means I will probably relocate *again*
the Lua sources, and I would have to change the license information.

Oh, and also: putting lfs in there would be nifty. And also some YAML and gzip
support. Just imagine if we could just put files into the executable and use
them as ressources...