[Tile-serving] [osm2pgsql] update to libosmium 2.3.0 (#444)

[Paul Norman]

Testing is showing this branch to be **much** slower

The PR
```
`which time` -l ./osm2pgsql -O null -d gis --cache 27000 -S empty.style ~/osm/planet/canada-150520.osm.pbf -r pbf
...
Node stats: total(261874403), max(3531488049) in 345s
Way stats: total(13825376), max(346632218) in 65s
Relation stats: total(214188), max(5167274) in 1s
...
Osm2pgsql took 412s overall
      411.87 real      1018.85 user        31.74 sys
   9855372  maximum resident set size
      2306  average shared memory size
        47  average unshared data size
       127  average unshared stack size
  13536167  page reclaims
         0  page faults
         0  swaps
        16  block input operations
         0  block output operations
         2  messages sent
         1  messages received
         0  signals received
    113680  voluntary context switches
     54833  involuntary context switches
```

master
```
`which time` -l ./osm2pgsql -O null -d gis --cache 27000 -S empty.style ~/osm/planet/canada-150520.osm.pbf -r
pbf
...
Node stats: total(261874403), max(3531488049) in 49s
Way stats: total(13825376), max(346632218) in 14s
Relation stats: total(214188), max(5167274) in 1s
...
Osm2pgsql took 65s overall
       65.61 real       317.41 user        37.93 sys
   9836284  maximum resident set size
      1125  average shared memory size
        43  average unshared data size
       127  average unshared stack size
   9856383  page reclaims
        28  page faults
         0  swaps
         4  block input operations
         0  block output operations
         2  messages sent
         1  messages received
         0  signals received
     38942  voluntary context switches
     80652  involuntary context switches
```

---
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https://github.com/openstreetmap/osm2pgsql/pull/444#issuecomment-132484831
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