dev-util/gdbus-codegen: add blocker on <dev-libs/glib-${PV}

I don't like blockers for this at all but it's what dev-libs/glib already
does for dev-util/gdbus-codegen, we just need the other direction here.

gdbus-codegen-2.84.0 emits code using g_variant_builder_init_static which
needs glib-2.84.0 for building + linking against.

Closes: https://bugs.gentoo.org/951313
Closes: https://bugs.gentoo.org/951115
Closes: https://bugs.gentoo.org/951345
Signed-off-by: Sam James <sam@gentoo.org>

dev-util/gdbus-codegen/gdbus-codegen-2.84.0-r1.ebuild

@@ -21,6 +21,7 @@ KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv
 
 RDEPEND="
 	${PYTHON_DEPS}
+	!<dev-libs/glib-${PV}
 "
 DEPEND="${RDEPEND}"
 BDEPEND="