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

[Paul Norman]

ugh.

I'd probably be able (and reluctantly willing) to patch around this on my machine, but others wouldn't, and I expect it would break the osm2pgsql port. Do we know if this also impacts OS X?

Options that I see include

* Not enabling C++11
* Enabling it when available, but detect the error with the code in [llvm bug 17798](https://llvm.org/bugs/show_bug.cgi?id=17798) and if present don't enable
* Enable it when available and break compilation on systems with the libc++ bug

cc @AMDmi3 



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