udev: improved to disable gobject-introspection support when needed

filesystem/udev/udev.conf

@@ -19,6 +19,10 @@ fi
 
 var_append confopt ' ' "--libexecdir=$libdir/udev"
 
+if ! pkginstalled gobject-introspection; then
+	var_append extraconfopt ' ' "--disable-introspection"
+fi
+
 udev_devices() {
 	local devdir="$root/lib/udev/devices"
 	local node=