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

[Jochen Topf]

I have experimented with that and it seems setting

```
# We don't want to use special compiler extensions because we want portability
set(CMAKE_CXX_EXTENSIONS OFF)

target_compile_features(osm2pgsql_lib PUBLIC cxx_std_17)
```

should work, because it has (mostly) the desired behaviour of setting `--std=c++17` if needed and nothing otherwise. It doesn't work for some reason on macOS though, I suspect that clang on macOS defaults to C++98 and CMake on macOS doesn't know this, so it doesn't set anything. Bummer.

There is also the problem of the fmt lib, see #1704 .

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