[Tile-serving] [openstreetmap/osm2pgsql] Display progress while processing pending relations/ways (#865)

[mmd]

`print_stats` seems to be busy looping, maybe you want to use something like `std::this_thread::sleep_for(60s);` instead?

Also checking the queue status probably needs some additional locking via `mutex.lock();` + `mutex.unlock();` like done in `do_jobs`.

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