[Tile-serving] [openstreetmap/osm2pgsql] Possible improvements for new ram middle (#1466)

[Jochen Topf]

The `node_locations_t::block_size = 32` turns out to be okay. With `= 16` the memory use is about twice as big, with `= 64` we save only about 1-5% memory. The runtime difference between 32 and 64 is minimal and vanishes in the noise. Lets stick with 32.

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