[Tile-serving] [openstreetmap/mod_tile] render_list multi threading is not working, it seems (Issue #405)

[Hummeltech]

@pkthogit , those warning messages are generally safe to ignore.

For your `renderd.conf`, I recommend you increase `num_threads`, I.E.:
```ini
[renderd]
stats_file=/run/renderd/renderd.stats
socketname=/run/renderd/renderd.sock
num_threads=40
tile_dir=/data/tile_cache/osm
```

Then, restart `renderd`, wait for it to start up and run `render_list` with the `max-load` option:
```
render_list --all --map default --min-zoom 0 --max-zoom 19 --num-threads 40 --max-load 40
```

It is going to take a very long time, but it will hopefully be able to fully utilize your system resources.

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