[gnome-desktop] (23 commits) Non-fast-forward update to branch ebassi/update-for-gtk4

[Emmanuele Bassi <ebassi src gnome org>]

The branch 'ebassi/update-for-gtk4' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  6e7b21a... Drop unnecessary include
  de90989... Replace deprecated use of GTimeVal
  3f43e30... build: Quiet the introspection scanner
  770f64d... build: Require a more recent version of Meson
  9ee553b... build: Use non-deprecated methods
  2db1c4e... Remove use of GTimeVal
  efbeb69... Avoid using deprecated GLib API
  3ca3b00... Remove unnecessary include to GDK
  d7d7b71... build: Use idiomatic Meson
  84faa3d... tests: Ignore deprecated API
  03e88b1... Remove invalid gtk-doc marker
  43f47e8... Add libgnome-desktop-4
  9a54bb5... build: Rename gtk_dep to gtk3_dep
  1dd5ac3... Use the C type for the element-type annotation
  b821130... Add libgnome-desktop-ui-4
  306fcf5... Remove unused GnomeRRScreenPrivate field
  7d621ab... build: Split libgnome-desktop-ui-4 into two
  9147eff... Port gnome-bg and gnome-rr to GTK4
  94e3fbc... Enable optional building of GTK4 libraries
  3e760e2... build: Allow disabling the legacy libgnome-desktop-3.0
  4fede25... build: Add configuration summary
  72be2c3... ci: Do not build GTK4 libraries on fedora:34

Commits added to the branch:

  9afdba1... Add Abkhazian translation (*)
  c79c058... Drop unnecessary include
  4a8d632... Replace deprecated use of GTimeVal
  ca6e772... build: Quiet the introspection scanner
  88e8209... build: Require a more recent version of Meson
  2441ca3... build: Use non-deprecated methods
  0511230... Remove use of GTimeVal
  3906fbb... Avoid using deprecated GLib API
  ab40a43... Remove unnecessary include to GDK
  f88336e... build: Use idiomatic Meson
  1f31fa0... tests: Ignore deprecated API
  3b89a0f... Remove invalid gtk-doc marker
  8b6d1a2... Add libgnome-desktop-4
  975731d... build: Rename gtk_dep to gtk3_dep
  a9fb76a... Use the C type for the element-type annotation
  c1e3106... Add libgnome-desktop-ui-4
  e9d552a... Remove unused GnomeRRScreenPrivate field
  b4ffba9... build: Split libgnome-desktop-ui-4 into two
  358b170... Port gnome-bg and gnome-rr to GTK4
  6fba269... Enable optional building of GTK4 libraries
  33d032c... build: Allow disabling the legacy libgnome-desktop-3.0
  f38a981... build: Add configuration summary
  fd98328... ci: Do not build GTK4 libraries on fedora:34

(*) This commit already existed in another branch; no separate mail sent