[Tile-serving] [openstreetmap/osm2pgsql] Using LuaJIT to speed up lua code (#801)

[Marcos Dione]

I have to say, I had the same thing. I imported twice the whole Europe using this lua style: https://github.com/SomeoneElseOSM/SomeoneElse-style/blob/master/style.lua . I also used the null output driver, as I don't have mush free space to do it for real. 

As @sav123 , I didn't notice any improvements, so probably @mmd-osm can tell us where or what to look? I definitely like the idea of the PR, speeding up imports, but if it actually has no (noticeable?) impact, I'm not sure it's worth it.

@mmd-osm just a question: did you try first without luajit and the with it? maybe the speed difference has more to do with your source file being already cached or something?

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