[MapServer-dev] Dropping support for PROJ <6 and GDAL <3

[Even Rouault]

Hi,

I've prepared 2 pull requests 
https://github.com/MapServer/MapServer/pull/6900 and 
https://github.com/MapServer/MapServer/pull/6901 to respectively drop 
support for PROJ < 6 and GDAL < 3 for MapServer 8.2

Any opposition to that?

Those older versions haven't been supported anymore and for a long time 
by their respective projects, the proposed minimal versions have been 
released 4 years ago and our CI doesn't test the dropped versions 
anymore, so I believe it is safe to proceed.

The PROJ < 6 drop removes quite a bunch of code paths so it is a nice 
cleanup. The GDAL < 3 has modest impacts, but anyway having PROJ >= 6 
and GDAL < 3 doesn't make sense as this is a rather unsupported combination.

Even

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