[Proj] Compiling Proj 5.2.0

[Even Rouault]

> So I am guegsing that whatever can currently be done in the C API will
> continue.

Yes, that was point 4: "existing proj C API still available through the plans 
exposed in the past."
And the deprecation plans for the previous generations of C API are exposed 
in:
https://proj4.org/development/index.html


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