gtk3+: update to 3.24.16.

Overview of Changes in GTK+ 3.24.16
===================================

* Fix the build

Overview of Changes in GTK+ 3.24.15
===================================

* filechooser:
- Fix a crash
- Support selecting directories with a new enough
  file chooser portal

* textview:
- Speed up tag handling

* wayland:
- Fix problems with clipboard handling
- Fix a crash in the Wayland input method
- Support cursor scale of 400%
- Fix a crash in glade

* css: Support font-feature-settings

* Adwaita:
- Use tabular figures where appropriate
- Color tweaks for dark mode
- Improve rendering of rounded corners

* Translation updates
Dutch
German
Japanese
Korean
Lithuanian
Norwegian Bokm奪l
Persian
Ukrainian

(wiz)