[gtk] (5 commits) Non-fast-forward update to branch wip/otte/gdk-headers

[Benjamin Otte <otte src gnome org>]

The branch 'wip/otte/gdk-headers' 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:

  88c325e... win32: Don't include gdkinternals.h
  e19afd7... macos: Don't include gdkinternals.h
  f7789f0... gdk: Remove gdkinternals.h
  516f28b... x11: Don't include gdkinternals.h
  25db106... win32: Fix gcc warnings

Commits added to the branch:

  5c3f250... win32: Don't include gdkinternals.h
  b0e60fc... macos: Don't include gdkinternals.h
  5a850d2... x11: Don't include gdkinternals.h
  46531a2... win32: Fix gcc warnings
  c22b162... gdk: Remove gdkinternals.h