[Tile-serving] [openstreetmap/osm2pgsql] Declaring C++ version in CMake config (#1010)

[Jochen Topf]

Just as a side note: GCC 5 and Clang 3.9 use C++98 as default, but both do support C++11 when asked, so there probably are a good number of compilers out there which do need the `-std=c++11` option to compile osm2pgsql, we can't just get rid of it.

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