Unfortunately there is no reasonable way to implement this function for all
glibc versions as the information we need is stored in the private
_GOptionGroup struct whose layout has already changed once (in 2.44) and could
change again, so we can't rely on it.
We really need a g_option_group_get_entries() in glib itself, but the request
to add it at http://bugzilla.gnome.org/show_bug.cgi?id=431021 hasn't been
touched since 10 years, so it seems unlikely to happen.
See
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