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

[Sarah Hoffmann]

@mmd-osm Sorry for the delay, it took a while for this issue to get to the top of my todo list.

I've tried now with the world and the openstreetmap-carto style and that worked out fine. I have about 2h processing time saved and pretty much all of it during the initial import stage. That is no surprise as that stage runs single-threaded, so faster Lua processing has a direct impact.

Given the low impact on code, I'd say we go ahead with it the way you have implemented it now: add it as an optional feature that is off per default. Code needs polishing, though, I'll add a couple of comments to the PR.

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