[Vala] LuaJIT vapi

[Antono Vasiljev <self antono info>]

Hello, all.

I've updated lua.vapi to use luajit headers[1]. Maybe this vapi
should also be available as luajit.vapi  from vala distribution (or 
somehow autogenerated from lua.vapi).

LuaJIT intented as (faster) drop-in replacement for Lua.

[1]: https://github.com/antono/valum/blob/master/vapi/luajit.vapi

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