[Tile-serving] [osm2pgsql] Excluding linestrings from polygon tables with multi backend (#270)

[Paul Norman]

> I would have suggested to add 'closedness' as an input property to the tag transforms. But if OSM data is well behaved enough, just dropping bad geometries is enough

I did consider that, but think it's well behaved enough.

It would also change the Lua tagtransform API. Now, there are some reasonable reasons for breaking compatibility for the multi-backend such as the roads flag being meaningless.

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