ci: gentoo: more GCC USE tweaks

Signed-off-by: Sam James <[email protected]>

ci/ciimage/gentoo/install.sh

@@ -106,10 +106,13 @@ cat <<-EOF > /etc/portage/package.use/ci
 	dev-lang/rust clippy rustfmt
 	dev-lang/rust-bin clippy rustfmt
 	dev-libs/boost python
-	sys-devel/gcc d
-	# Needed to get the binpkg for gcc[d] (and maybe we'll have Ada
-	# support in Meson one day, anyway)
-	sys-devel/gcc ada pgo lto
+
+	# Some of these settings are needed just to get the binpkg but
+	# aren't negative to have anyway
+	sys-devel/gcc ada d
+	>=sys-devel/gcc-13 ada objc objc++
+	sys-devel/gcc pgo lgo
+
 	sys-libs/zlib static-libs
 EOF