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

[alex85k]

By the way, one lock_guard in  get_wkt_split  seemed to be enough...
https://github.com/alex85k/osm2pgsql/commits/replace-pthread-with-stdthread


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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/498#issuecomment-155530907
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