[Tile-serving] [osm2pgsql] 0.88.1 backports (#421)

[Paul Norman]

backported b452e7cc8bcfbd95ceca8d5f21066a1d7ddd0ab8, trivial std::isnan fix needed for homebrew

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https://github.com/openstreetmap/osm2pgsql/issues/421#issuecomment-129136560
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