[gtk] (6 commits) Non-fast-forward update to branch debug-envvars-cleanup

[Matthias Clasen <matthiasc src gnome org>]

The branch 'debug-envvars-cleanup' 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:

  c7e10f1... wip: win32: Use the new debug macros
  db579c1... gsk: Introduce new debug macros
  6b82ffb... gsk: Use the new debug macros
  a71d47c... gsk: drop old debug macros

Commits added to the branch:

  56f96b9... gdk: Drop old debug macros
  850a26c... gsk: Introduce new debug macros
  8f5e25e... gsk: Use the new debug macros
  32807f5... gsk: drop old debug macros
  1fdfe5c... gtk: Introduce new debug macros
  bcb172a... gtk: Use the new debug macros