[Tile-serving] [openstreetmap/osm2pgsql] Form polygons from relations which aren't closed (#792)

[Paul Norman]

I've edited the title to be about forming polygons from unclosed relations.

I don't think the concave hull algorithm would work. For example, look at the following unclosed linestring and a possible concave hull

![image](https://user-images.githubusercontent.com/1190866/31407930-9456a13a-adbb-11e7-9176-db5cc9688109.png)

There are probably better algorithms, but I don't think we want to do this. We've moved away from attempting to repair invalid geometries.

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