[Tile-serving] [openstreetmap/osm2pgsql] Use libosmium for geometry building (#684)

[Frederik Ramm]

One of the things I do at $DAYJOB is sell shape files generated from OSM data, where I typically discard invalid polygons. I'd like to support imagico's assessment - nobody cares if a house goes missing, but everyone notices if a 50km segment of the Rhone is lacking its riverbank area. So yes, it might be "only" a few thousand relations but there will be many large ones and there will be complaints. On the other hand people who post-process OSM data like me will finally be free from user complaints like "but this forest is visible on the OSM web site, why is it not in your shapefile?", so +1 for dropping invalid stuff. Incidentally I made an attempt to do that 5 years ago in 8be0cfc3caabaac3a48b9202eabefcfaced4647d, maybe this time it gets through ;)

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