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

[Paul Norman]

With a standard OpenStreetMap Carto import

```
Libosmium 2.15.0
Lua 5.2.4
Processing: Node(5006981k 1866.2k/s) Way(559475k 38.71k/s) Relation(6549380 1141.60/s)  parse time: 22872s
Node stats: total(5006981640), max(6240800798) in 2683s
Way stats: total(559475293), max(666563604) in 14452s
Relation stats: total(6549807), max(9266826) in 5737s
```

```
Libosmium 2.15.0
Lua 5.1.4 (LuaJIT 2.0.4)
Processing: Node(5006981k 5401.3k/s) Way(559475k 77.52k/s) Relation(6548690 1182.29/s)  parse time: 13683s
Node stats: total(5006981640), max(6240800798) in 927s
Way stats: total(559475293), max(666563604) in 7217s
Relation stats: total(6549807), max(9266826) in 5539s
```

The other parts of osm2pgsql take approximately 22000 seconds, meaning luajit shaves about a quarter of the import time.

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