[Tile-serving] [osm2pgsql] add linking against boost atomic library (#355)

[Sarah Hoffmann]

Changed so that boost::atomic is only added when lockfree queue is used (and will silently fall back to non-lockfree version when atomic is not found).

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/355#issuecomment-105240838
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