Problem: Autoconf 2.69 too old
Solution: Migrate to Autoconf 2.71
Autoconf 2.69 is almost 10 years old. And 2.71 is also a few years old
as well. Should be pretty well tested by now. It brings a lot of
improvements and there seems to be an ongoing work on autoconf 2.72
already.
This change just addresses two minor changes `autoupdate` suggested, and
then `src/auto/configure` is regenerated by running
cd src
make AUTOCONF=autoconf2.71 autoconf
closes: #12958
Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Illia Bobyr <illia.bobyr@gmail.com>
a96d544bc3
