[Tile-serving] [osm2pgsql] Don't rely on dropbox files for appveyor (#476)

[alex85k]

If Mapbox team agrees, the simplest solution would be to use dependencies pack generated by 
the project https://github.com/mapbox/windows-builds
@springmeyer @BergWerkGIS 

libosmium and OSRM already uses it

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/476#issuecomment-151766852
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