libconfuse: bugfix bump to 3.2

libconfuse: bugfix bump to 3.2

This release contains only two real changes to fix two bugs. One is
only relevant for Windows; the other one fixes handling of empty
comment lines.

libconfuse is used by genimage, and we have one defconfig,
linksprite_pcduino, that has empty comment lines in its genimage.cfg.
Thus, it fixes https://gitlab.com/buildroot.org/buildroot/-/jobs/27873642

While we're at it, also change the upstream URL in Config.in to github.
The old URL on nongnu was just a download directory and didn't have
anything newer than 2010, while github has a nice README.md.

Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Cc: Frank Hunleth <fhunleth@troodon-software.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>