[gtk] (3 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:

  725edc6... gtk-demo: Use a scope for callbacks
  49a9e57... ci: Try to run tests on macos

Commits added to the branch:

  6a24e0c... Add an introspection api test (*)
  4e2a263... Merge branch 'introspection-test' into 'master' (*)
  092a56c... ci: Try to run tests on macos

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