[postgis-devel] Bump GDAL and Proj versions for PostGIS 3

[Christoph Berg]

Re: Darafei "Komяpa" Praliaskouski 2019-07-07 <CAC8Q8tL8m+VQ68Vrwhb_HDv17ko2V9B80=vtjHNhAxixjQAEqA at mail.gmail.com>
>  - bump minimum GDAL to 2.0, stripping off the last ifdef for it and
> jumping to version released in 2015 and not a decade ago.

That cuts off Debian Jessie which has 1.10, but we aren't building
postgis for jessie anymore anyway.

>  - bump minimum Proj version to 5, as recommended by EvenR on IRC, so that
> we can use the new proj projections definitions without fear it's not
> understood by installed proj. That will also strip a bunch of ifdefs on
> geodetics.

That would cut off Debian Stretch with 4.9. Please don't do that yet.

Christoph