a11y: Don't allocate a list just for counting widgets in GtkContainerAccessible
a11y: Don't allocate a list just for counting widgets in GtkContainerAccessible

It's more straightforward if counting through gtk_container_foreach().

Lyude/gtk-,Lyude/gtk-,jigpu/gtk,chergert/gtk,msteinert/gtk,davidgumberg/gtk,chergert/gtk,alexlarsson/gtk,grubersjoe/adwaita,jigpu/gtk,Sidnioulz/SandboxGtk,ahodesuka/gtk,jessevdk/gtk,alexlarsson/gtk,alexlarsson/gtk,chergert/gtk,alexlarsson/gtk,chergert/gtk,jadahl/gtk,jadahl/gtk,grubersjoe/adwaita,jigpu/gtk,alexlarsson/gtk,alexlarsson/gtk,ahodesuka/gtk,Lyude/gtk-,msteinert/gtk,Lyude/gtk-,davidgumberg/gtk,Lyude/gtk-,grubersjoe/adwaita,Adamovskiy/gtk,Adamovskiy/gtk,Lyude/gtk-,Adamovskiy/gtk,Sidnioulz/SandboxGtk,chergert/gtk,ahodesuka/gtk,ahodesuka/gtk,ahodesuka/gtk,msteinert/gtk,jessevdk/gtk,chergert/gtk,ahodesuka/gtk,davidgumberg/gtk,jigpu/gtk,alexlarsson/gtk,Adamovskiy/gtk,jadahl/gtk,jadahl/gtk,Adamovskiy/gtk,Adamovskiy/gtk,grubersjoe/adwaita,Sidnioulz/SandboxGtk,ahodesuka/gtk,jigpu/gtk,Sidnioulz/SandboxGtk,jadahl/gtk,davidgumberg/gtk,jessevdk/gtk,grubersjoe/adwaita,jessevdk/gtk,jessevdk/gtk,grubersjoe/adwaita,davidgumberg/gtk,ahodesuka/gtk,jigpu/gtk,msteinert/gtk,jadahl/gtk,Lyude/gtk-,grubersjoe/adwaita,davidgumberg/gtk,Sidnioulz/SandboxGtk,Sidnioulz/SandboxGtk,jigpu/gtk,chergert/gtk,Adamovskiy/gtk,davidgumberg/gtk,jadahl/gtk,Lyude/gtk-,chergert/gtk,jigpu/gtk,jadahl/gtk,jessevdk/gtk,msteinert/gtk,davidgumberg/gtk,jessevdk/gtk,alexlarsson/gtk,grubersjoe/adwaita,msteinert/gtk,Adamovskiy/gtk