[gtk] Non-fast-forward update to branch bilelmoussaoui/annotations-fix

[Bilal Elmoussaoui <bilelmoussaoui src gnome org>]

The branch 'bilelmoussaoui/annotations-fix' 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:

  a6cffef... gtk: annotate the return type of gtk_single_selection_get_s
  af11947... Update gtksingleselection.c

Commits added to the branch:

  aae67b8... gtk: update annotation of gtk_single_selection_get_selected