gtk3: updated to 3.24.31

Overview of Changes in GTK+ 3.24.31, 20-12-2021
===============================================

* input:
- Fix a crash with touch on GtkScale

* clipboard:
- Avoid a double-free

* css:
- Avoid a crash with radial gradients

* GtkFileChooser:
- Don't leak search results

* GtkTextView:
- Support css letterspacing

* Wayland:
- Reset position when hiding popups
- Ignore globals we did not bind ourselves
- Avoid infinite loops when hiding surfaces
- Avoid clipboard-related lockups

* X11:
- Trap errors while doing XRANDR calls
- Support touchpad gestures with XI 2.4

* win32:
- Some OpenGL setup fixes
- Fall back to GLES for OpenGL
- Fix MinGW autotools build
- Fix building on Windows 11
- Support building with Visual Studio 2022
- Improve DND across monitors
- Rewrite keymap handling code

* macOS:
- Accept NSPasteboardTypeFileURL drops
- Build on macOS 12
- Fix display on macOS 12
- Fix keyboard layout notifications
- Fix a crash
- Improve performance on Big Sur

* Translation updates:
Basque
Brazilian Portuguese
Chinese (China)
Chinese (Taiwan)
Croatian
Czech
Danish
Dutch
Finnish
French
Friulian
Galician
German
Hungarian
Icelandic
Italian
Kazakh
Korean
Latvian
Occitan
Persian
Russian
Serbian
Spanish
Swedish

(adam)