dev-libs/glib: workaround Portage bug with binpkgs

With binpkgs, we seem to sometimes get a new dev-libs/gobject-introspection-1.82
installed which needs >=dev-libs/glib-2.82, but without the new glib. We
then try to build glib, we see that we have a gobject-introspection installed
that is new enough via `has_version` (=> we don't try to bootstrap it), then
when trying to use it via `pkg-config`, it falls off because we don't have
the glib that it needs.

This is obviously a Portage bug in not ensuring that gobject-introspection's
dependencies are satisifed before merging its binpkg, but let's workaround
it here: check thoroughly if the available gobject-introspection is usable. If
it ain't, just bootstrap as if it weren't installed.

(Just closing the bug given we don't have a testcase, not much point
in keeping it open and potentially confusing people. It only happens
sometimes and requires some bad luck, unfortunately. If it were always
the case w/ binpkgs, it'd be far easier to debug.)

Closes: https://bugs.gentoo.org/951487
Thanks-to: Artemis Everfree <artemis@artemis.sh>
Signed-off-by: Sam James <sam@gentoo.org>

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