[Tile-serving] [openstreetmap/osm2pgsql] Default value for `--cache` (#1501)

[mboeringa]

> * The `--cache/-C` setting has been ignored in non-slim mode for a while.

@joto, does this remark mean the cache setting is truly _completely ignored_ when running in non-slim mode, so setting it or not will not do anything?

> * TODO: Add warning when running osm2pgsql in that case that cache setting is ignored.

Am I right this is still on your TODO list? I yesterday attempted a (successful) Planet import in non-slim mode, but I set a large --cache value based on the remark quoted below regarding non-slim mode needing to also store ways and relations, in [this section of the osm2pgsql manual](https://osm2pgsql.org/doc/manual.html#caching), but no such warning showed up with osm2pgsql version 1.8.1

> In --slim mode, this is just node positions while in non-slim mode **_it has to store information about ways and relations too_**.

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