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

[mmd]

> I can do that if someone tells me how.

Thanks a lot, that would be really helpful! On Ubuntu 18.04, it's only a matter of installing LuaJIT libraries and adding another parameter to `cmake` to turn on LuaJIT. Everything else should work out of the box as is.

### Install luajit5.1 dev library

```
sudo apt install libluajit-5.1-dev
```

### cmake with LUAJIT enabled

(from within osm2pgsql/build directory)

```
cmake -D WITH_LUAJIT=ON ..
```

### make

```
make -j7
```

### Verify build

Reported version number should include LuaJIT in there

```
~/osm2pgsql/build$ ./osm2pgsql --version
osm2pgsql version 0.96.0 (64 bit id space)

Compiled using the following library versions:
Libosmium 2.15.0
Lua 5.1.4 (LuaJIT 2.1.0-beta3)
```




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