Log Message:
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:
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 German
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