[gtk] (6 commits) Non-fast-forward update to branch wip/otte/build

[Matthias Clasen <matthiasc src gnome org>]

The branch 'wip/otte/build' 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:

  a36b3c1... build: Set proper defaults for media backends
  40e33e1... build: disable Vulkan by default
  1a4a646... build: Remove sassc option
  58fa50e... build: Make all X11 extensions mandatory
  11af3c3... x11: Remove unused headers
  4d0bf15... x11: Remove XComposite

Commits added to the branch:

  30eb178... build: Set proper defaults for media backends
  1272f3d... build: disable Vulkan by default
  8857cd3... build: Remove sassc option
  eb0ccd2... build: Make all X11 extensions mandatory
  9b9fb4c... x11: Remove unused headers
  0b3dc9a... x11: Remove XComposite