[mutter] (40 commits) Non-fast-forward update to branch wip/carlosg/backendless-clutter

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/backendless-clutter' 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:

  556d39c... backends/native: Remove unused array definition
  102cf18... clutter: Demote CLUTTER_NOTE to g_debug in clutter-stage-co
  c09960b... clutter: Make ClutterDamageHistory API public to mutter
  b6c0405... clutter: Make ClutterStageView API public to mutter
  4d97f65... clutter: Export private function to get debug flags
  c7202da... core: Add private utility function to get Clutter debug fla
  5a85202... clutter: Move ClutterStageCogl[View] code to src/backends
  5bc2867... backends: Rename ClutterStage[View]Cogl API and types
  cd1b847... backends: Excise MetaStageView to its own file
  0aac15b... clutter: Drop Xsettings client code
  2aad412... clutter: Drop dead X11 code
  805e6b1... backends: Shuffle ClutterBackendX11 code into MetaClutterBa
  cd5d2d4... clutter: Drop generation of x11 pkgconfig file
  30bcdc0... clutter: Remove leftovers from backend code in build system
  2abacfb... clutter: Remove unused EGL header

Commits added to the branch:

  4ed0583... wayland: Close pipe file descriptors after use (*)
  955eb64... Update French translation (*)
  e15b4b8... test-runner: Disconnect display-opened signal on destructio (*)
  7d88386... mutter-cogl.test: Use xvfb-run to run the cogl tests (*)
  14c8f5f... mutter-all.test: Run tests in a environment with display an (*)
  f390340... cogl/clip-stack-gl: Remove unused code: #define GL_CLIP_PLA (*)
  c3d64cc... cogl: Add new option COGL_DEBUG=stencilling to disable opti (*)
  5991f53... cogl/clip-stack-gl: Set glStencilMask correctly for clip re (*)
  216bb7f... cogl/clip-stack-gl: Set glStencilMask correctly for clip re (*)
  936696a... cogl/winsys-glx: Request 2 stencil bits (*)
  ea626a5... main: Avoid calling meta_wayland_compositor_get_default() o (*)
  dce3aa5... clutter/actor: Don't emit focus signals during destruction (*)
  97c6a68... clutter/stage-cogl: Ensure queued_redraw_clip is not empty (*)
  2a81c6d... screen-cast: Clean up sessions on 'prepare-shutdown' (*)
  8478db9... renderer-native: Don't attempt to queue mode sets on non-on (*)
  fcdda41... wayland: Make implicit grabs during popups be owner_events= (*)
  c0758c6... native: Properly ignore devices on init too (*)
  c3feb83... udev-rules: Use ID_PATH to detect vkms (*)
  a0343b0... renderer/native: Clear pending update list before repopulat (*)
  d824c14... Update Slovak translation (*)
  dc91999... wayland/pointer-gestures: Fix swipe cancellation (*)
  e50a637... Update Occitan translation (*)
  bb01e3f... Update Russian translation (*)
  a466738... project: Add HACKING.md (*)
  8da65d7... clutter: Add new ClutterContent type ClutterTextureContent (*)
  d3fb9ec... backends/native: Remove unused array definition
  40e6e14... clutter: Demote CLUTTER_NOTE to g_debug in clutter-stage-co
  551a576... clutter: Make ClutterDamageHistory API public to mutter
  67dcc1e... clutter: Make ClutterStageView API public to mutter
  59afe7f... clutter: Export private function to get debug flags
  ffbda57... core: Add private utility function to get Clutter debug fla
  3b3c9fc... clutter: Move ClutterStageCogl[View] code to src/backends
  bcf2a46... backends: Rename ClutterStage[View]Cogl API and types
  f73076e... backends: Excise MetaStageView to its own file
  31c2dac... clutter: Drop Xsettings client code
  83186f6... clutter: Drop dead X11 code
  de3b37e... backends: Shuffle ClutterBackendX11 code into MetaClutterBa
  2da335d... clutter: Drop generation of x11 pkgconfig file
  0efc14b... clutter: Remove leftovers from backend code in build system
  2bd1d89... clutter: Remove unused EGL header

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