[gtk] (6 commits) Non-fast-forward update to branch wip/baedert/for-master

[Timm Bäder <baedert src gnome org>]

The branch 'wip/baedert/for-master' 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:

  9d0de41... Compile private sources in css/ as C++
  b610e3b... cssparser: Make a signed expression unsigned
  9418c29... fontrendering: Protect against NULL hints
  9f90ab4... theme: enable tabular numbers in GtkCalendar

Commits added to the branch:

  aa0c22b... glcontext: Reinstate missing "!" (*)
  7a50eba... gdk: Move GdkMemoryFormat enum to gdktypes.h (*)
  f6e5a33... Merge branch 'wip/otte/for-master' into 'master' (*)
  d3d7b82... cssparser: Make a signed expression unsigned
  8f3a83b... fontrendering: Protect against NULL hints
  566bd4e... theme: enable tabular numbers in GtkCalendar

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