[Tile-serving] [openstreetmap/osm2pgsql] Geos36 (#636)

[Sandro Santilli]

getDefaultInstance definition is here:
https://github.com/libgeos/libgeos/blob/svn-3.5/src/geom/GeometryFactory.cpp#L728

At this stage the Factory has no state, so shouldn't be a big deal to use from multiple threads (beside taking care of not leaking one by calling getDefaultInstance at the same time by multiple threads). But in the future things may change.

The C-API of GEOS has a thread-safe interface, and you should still switch to it for API stability.

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