Warn for 5.3 and earlier

[DarkWiiPlayer <darkwiiplayer@...>]

Greetings Lua-l!

I was getting a bit annoyed that `warn` exists now but it can't really
be used in any code that needs to run on older versions of Lua (which is
really most code I write), so I threw together a quick pure-Lua
implementation.

It's available on github: https://github.com/darkwiiplayer/lua-warn

and on Luarocks: luarocks install warn

It can both monkey-patch the warn function everywhere or just return its
custom implementation, depending on whether environment pollution is
acceptable.

I hope you find it useful :D

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