udev: fixed to check if gobject-introspection is effectively installed

filesystem/udev/udev.conf

@@ -28,7 +28,7 @@ for x in glib gperf acl libusb usbutils; do
 	fi
 done
 
-if ! pkginstalled gobject-introspection; then
+if ! pkginstalled -f gobject-introspection; then
 	var_append extraconfopt ' ' "--disable-introspection"
 fi