[Tile-serving] [openstreetmap/osm2pgsql] Potential memory leak when running without flatnode option (#931)

[Frederik Ramm]

Note that PostgreSQL can allocate its configured `work_mem` for every database connection. An osm2pgsql run with --number-processes 16 can cause memory usage of `shared_buffers` + `maintenance_work_mem` + 16 * `work_mem` on PostgreSQL's side alone, not even counting osm2pgsql's own memory footprint. 

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