Drop volatile qualifiers
Fixes build with GCC11 glib was also adjusted accordingly, see for example https://gitlab.gnome.org/GNOME/glib/-/issues/600
Addresse #19 (closed)
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Fixes build with GCC11 glib was also adjusted accordingly, see for example https://gitlab.gnome.org/GNOME/glib/-/issues/600
Addresse #19 (closed)