gtk: Gir: Use builder_postprocess to register app startup hook
@@ -576,6 +576,7 @@ status = "generate"
name = "Gtk.Application"
status = "generate"
trait_name = "GtkApplicationExt"
+builder_postprocess = "Application::register_startup_hook(&ret);"
manual_traits = ["gio::ApplicationExtManual"]
[[object.function]]
name = "new"
