[gtk] (9 commits) Non-fast-forward update to branch macos-ci

[Matthias Clasen <matthiasc src gnome org>]

The branch 'macos-ci' 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:

  23d2d12... ci: Add a macos build
  4dffc5b... try a newer meson
  8935327... cairo-pdf is needed
  ce4c3c3... Remove cairo header checks
  3b072ed... Collect artifacts harder
  4dd9520... No -Werror please
  c06bc51... force c++11
  9859191... disable pixman tests
  b6214c6... Try to fix the cairo build on OS X
  64606ab... Build harfbuzz with coretext on OS X
  cc6c1ae... Pull in gdk-pixbuf fixes

Commits added to the branch:

  e383547... Update German translation (*)
  51a6b29... Update German translation (*)
  3d81f6e... ci: Add a macos build
  d7aaa5d... printing: cairo-pdf is needed
  aabf678... printing: Remove cairo header checks
  22cdee5... ci: Fix the harfbuzz build on MacOS
  3b387b1... ci: Disable pixman tests on MacOS
  03c7650... Fix the cairo build on OS X
  f3d4454... Pass coretext=enabled to harfbuzz

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