core: drop "volatile" for g_once_init_enter locations
This fixes a few (fatal in gcc 11) warnings.
See https://gitlab.gnome.org/GNOME/glib/-/issues/600
(cherry picked from commit 268cab88)
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This fixes a few (fatal in gcc 11) warnings.
See https://gitlab.gnome.org/GNOME/glib/-/issues/600
(cherry picked from commit 268cab88)