[Tile-serving] [openstreetmap/osm2pgsql] Fix reprojection when using Proj version 6 and above (PR #1629)

[Jochen Topf]

Something is terribly broken here. The projection to EPSG:5520 gets a different result in Ubuntu 18 than in Ubuntu 20. This is not just our code that's broken. I get a different result on [epsg.io](http://epsg.io/transform#s_srs=4326&t_srs=5520&x=10.0000000&y=53.0000000) than when I try this locally in PostgreSQL:

```
select st_astext(st_transform(st_setsrid(st_makepoint(10.0, 53.0), 4326), 5520));
┌─────────────────────────────────────────────┐
│                  st_astext                  │
├─────────────────────────────────────────────┤
│ POINT(1969579.1472745757 5896972.954884315) │
└─────────────────────────────────────────────┘

```

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