Update to build with latest glib
glib replaced its glib::object_subclass!() macro with a #[glib::object_subclass] attribute, to simplify a bunch of things.
See https://github.com/gtk-rs/gtk-rs/commit/fdc8459b39f692919bed586abda22793ab42f15f
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glib replaced its glib::object_subclass!() macro with a #[glib::object_subclass] attribute, to simplify a bunch of things.
See https://github.com/gtk-rs/gtk-rs/commit/fdc8459b39f692919bed586abda22793ab42f15f