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

[mmd]

The quality of this patch is still not good enough for a PR, but since you asked for one for testing purposes... :smile: 

Disabling WITH_LUAJIT settings via ccmake doesn't really work once it has been enabled once. I'm pretty sure there's some way to fix these caching issues, but I didn't investigate this any further yet. So for the time being, you would have to use a new build directory for testing:

1. Start with new clean `build` directory
2. Run `cmake -D WITH_LUAJIT=ON ..`
    Libraries used to build should include libluajit-5.1.so towards the end of the list. 
3. Build via `make` as usual.



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