[Tile-serving] [openstreetmap/osm2pgsql] Update options.cpp (#893)

[mmd]

I think that depends a bit on the size of the extract and the distribution of node ids: on a file system with 4K block size,12 mio nodes would be theoretical lower bound to still allocate 50GB, assuming equal distribution of node ids. In reality it won't be this bad, though.

One way to keep nodes.cache small for a one-time import could be renumbering ids via https://docs.osmcode.org/osmium/latest/osmium-renumber.html. 


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