[Tile-serving] [openstreetmap/osm2pgsql] Log thread id in each log line when debug logging is enabled (#1382)

[Jochen Topf]

On Linux this looks something like this:

```
...
2020-12-20 16:43:05  140587509511936 Clustering table 'lines' by geometry...
2020-12-20 16:43:05  140587526297344 Clustering table 'points' by geometry...
2020-12-20 16:43:05  140587551475456 Clustering table 'polygons' by geometry...
2020-12-20 16:43:05  140588667282560 node cache: stored: 1439690(100.00%), storage efficiency: 49.89% (dense blocks: 3, sparse nodes: 1430441), hit rate: 100.00%
2020-12-20 16:43:05  140587517904640 Clustering table 'routes' by geometry...
2020-12-20 16:43:05  140587517904640 Using native order for clustering table 'routes'
2020-12-20 16:43:05  140587551475456 Using native order for clustering table 'polygons'
2020-12-20 16:43:05  140587509511936 Using native order for clustering table 'lines'
...
```
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1382

-- Commit Summary --

  * Log thread id in each log line when debug logging is enabled

-- File Changes --

    M src/logging.hpp (9)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1382.patch
https://github.com/openstreetmap/osm2pgsql/pull/1382.diff

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