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

[martin-s]

I would rather change node-ram-cache.hpp to:
```
ramNode(double lon, double lat) : _lon(lon), _lat(lat) {}
```

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/512#issuecomment-160480665
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