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

[Paul Norman]

> Geometry type is determined by tagging only. Previously osm2pgsql would create polygons only when a polygon was requested by the tagtransform and the geometry could actually assembled into rings. Otherwise a linestring was added to the *_ways table. This could lead to the odd situation where a partially broken multipolygon had some of its rings in the polygon table and the unclosed ways in the ways table. New behaviour is that only the result of tagtransform (or for output-multi: the requested format for the table) is taken into account. In some corner cases, this can lead to a regression with the C-transform when keys may describe a polygon or a way.

How will this work with `man_made=pier`?

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