[Tile-serving] [osm2pgsql] Optionally enable C++11 (#332)

[Sarah Hoffmann]

Looks like a bug specific to the libc++ version in FreeBSD: https://groups.google.com/forum/#!topic/fa.freebsd.current/iKNLKbRgFZw

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/332#issuecomment-93559994
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