[Tile-serving] [openstreetmap/osm2pgsql] Use libosmium for geometry building (#684)

[Paul Norman]

Numbers from a test with master (b9d7fcc162aabda0e972fba4a6a616cb0da5eaa0) and this PR (0333e11adff2a7e09fb3ae00a0de69ae5dc87ad6)

pr
```
Node stats: total(3706912087), max(4630874436) in 548s
Way stats: total(389670834), max(468563887) in 2308s
Relation stats: total(4734167), max(6908001) in 3582s
Finished processing 267057024 ways in 4428 s
All indexes on planet_osm_roads created in 903s
All indexes on planet_osm_point created in 2347s
All indexes on planet_osm_line created in 5859s
All indexes on planet_osm_polygon created in 9432s
Osm2pgsql took 20310s overall
User time (seconds): 11826.25
Maximum resident set size (kbytes): 40146944
Involuntary context switches: 69054
```

master
```
Node stats: total(3706912087), max(4630874436) in 639s
Way stats: total(389670834), max(468563887) in 2864s
Relation stats: total(4734167), max(6908001) in 4775s
Finished processing 267057051 ways in 6517 s
All indexes on planet_osm_roads created in 916s
All indexes on planet_osm_point created in 2468s
All indexes on planet_osm_line created in 5876s
All indexes on planet_osm_polygon created in 9605s
Osm2pgsql took 24412s overall
User time (seconds): 29804.55
Maximum resident set size (kbytes): 39976848
Involuntary context switches: 2654796
```

This is saving over an *hour* on a 6 hour import. Interestingly, master is more parallel, probably because it has more work to do.

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