[gdal-dev] autoconf and nmake build systems ready to be removed

[Even Rouault]

Andrew,
> Conda builds on github seem to be failing because of this:
>
yep this is a known issue until 
https://github.com/conda-forge/gdal-feedstock/pull/629 is ready for merge

Note that those CI Conda based builds were also occasionally broken 
before, sometimes for mysterious reasons (at least to me).

Even

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