[mutter] (4 commits) Non-fast-forward update to branch wip/carlosg/fix-second-monitor-invalidations

[Carlos Garnacho <carlosg src gnome org>]

The branch 'wip/carlosg/fix-second-monitor-invalidations' 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:

  ce68ece... clutter/cogl: Fix invalidation on non-primary monitors with

Commits added to the branch:

  13d9e4d... cogl: Remove unused cogl/cogl-pango.h (*)
  793c2ac... cogl: Remove unused cogl-deprecated.h (*)
  260b434... clutter/cogl: Fix invalidation on non-primary monitors with
  be49246... Revert "clutter/cogl: Store empty clip regions for buffer a

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