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

[Paul Norman]

I reduced the problem to an issue on my end with versions. I'd still like to check for the bug with configure as there's probably OS X versions with the same bug present.

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https://github.com/openstreetmap/osm2pgsql/pull/332#issuecomment-93660495
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