Fix plugin search with GLib 2.69.

Review Request #856 — Created July 30, 2021 and submitted — Latest diff uploaded

Information

gplugin/gplugin
default

Reviewers

Named groups in GRegex with GLib 2.69 appear to return empty, not NULL strings, so handle that when running version comparison.

This is actually what GLib documents should happen, but I guess didn't work right before.

Compiled and ran tests on Fedora Rawhide with GLib 2.69.