[Tile-serving] [openstreetmap/osm2pgsql] Work-in-progress: Add support for projection using PROJ library >6.1 (#1331)

[Jochen Topf]

This is a stab at adding projection support using the PROJ library from
6.1 onwards. There might be an issue with multithreading, but the old
code most likely already had that issue. This needs to be checked.

The CMake config will prefer using the old API, simply because I don't
know how to check for the new API without it trying to use the new API
with version 5-6.0 which don't have everything we need. The code will
only work from 6.1 onwards.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1331

-- Commit Summary --

  * Work-in-progress: Add support for projection using PROJ library >6.1

-- File Changes --

    M CMakeLists.txt (23)
    M src/CMakeLists.txt (2)
    A src/reprojection-generic-proj6.cpp (121)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1331.patch
https://github.com/openstreetmap/osm2pgsql/pull/1331.diff

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