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

[alex85k]

> @@ -15,7 +15,9 @@
>  #include <string.h>
>  #include <sys/stat.h>
>  #include <sys/types.h>
> -#include <unistd.h>
> +#ifndef _WIN32
> +#    include <unistd.h>
> +#endif
>  

This should not be needed. There are many other unistd includes, so cmake just generates empty unistd.h.

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https://github.com/openstreetmap/osm2pgsql/pull/512/files#r46559309
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