gplugin/gplugin

Use g_queue_clear_full as we long ago required glib 2.60

2022-03-15, Gary Kramlich
aab3e0707aeb
Use g_queue_clear_full as we long ago required glib 2.60

Testing Done:
Compiled and verified the warning was gone.

Reviewed at https://reviews.imfreedom.org/r/1351/
<?xml version="1.0" encoding="UTF-8"?>
<gresources>
<gresource prefix="/org/imfreedom/keep/gplugin/gplugin/viewer/">
<file compressed="true">window.ui</file>
</gresource>
</gresources>