[gtk] (4 commits) Non-fast-forward update to branch arnaudb/requires

[Arnaud B. <arnaudb src gnome org>]

The branch 'arnaudb/requires' 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:

  9b84ed1... Drop “gtk+” plus sign in GtkBuilder <requires>.
  3493c85... Teach `gtk-builder-tool` to rewrite <requires>.
  76d8a55... Document the GtkBuilder <requires> tag changes.

Commits added to the branch:

  db6d7dc... Drop “gtk+” plus sign in GtkBuilder <requires>.
  e6d46ec... Teach `gtk-builder-tool` to rewrite <requires>.
  08f2990... Document the GtkBuilder <requires> tag changes.
  f7de0bc... Fix tests with regard to GtkBuilder <requires>.