[Tile-serving] [openstreetmap/osm2pgsql] unused column "way_area" in the _line and _roads tables (#734)

[tb]

> It's normal to not have an area for those, since they're not polygons.

Yes, that's obvious, and this is the main reason for opening this issue ;)
But wouldn't [ST_Length](http://postgis.net/docs/ST_Length.html) fit here perfectly?

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