Making luaconf.h settings available in Lua

[Reuben Thomas <rrt@...>]

It would be great if the settings from luaconf.h were available in
Lua. For example, one could write:

-- like Perl's File::Spec::catfile
function catfile (...)
  return table.concat ({...}, LUA_DIRSEP)
end

Of course, it would be easy to write a luaconf Lua binding, but it
seems an obvious thing for Lua itself to do.

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