[Tile-serving] [osm2pgsql] Replace pthread and boost::thread with std::async (#498)

[alex85k]

https://trac.osgeo.org/geos/ticket/260

It would be good to use stringstream.imbue for setting locale in geos instead of CLocalizer but I do not know how to make they accept it.

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https://github.com/openstreetmap/osm2pgsql/pull/498#issuecomment-155697537
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