[Tile-serving] [osm2pgsql] Windows: Fix msvc build (#512)

[alex85k]

> @@ -21,7 +21,10 @@
>  */
>  
>  #include <boost/format.hpp>
> -
> +#ifdef _WIN32
> +#    define NOMINMAX
> +#    include <WinSock2.h>

We already have -DNOMINMAX in cmake. 
Why WinSock.h?

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