Use g_slist_foreach_full glib implementation
Use g_slist_foreach_full glib implementation

For the compat case (glib < 2.28), we were using our own implementation
instead of directly reusing glib code.

elmarco/spice-gtk,SPICE/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,SPICE/spice-gtk,Fantu/spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,freedesktop-unofficial-mirror/spice__spice-gtk,fgouget/spice-gtk,elmarco/spice-gtk,SPICE/spice-gtk,Fantu/spice-gtk,guodong/spice-gtk,flexVDI/spice-gtk,fgouget/spice-gtk,flexVDI/spice-gtk,SPICE/spice-gtk,guodong/spice-gtk,Fantu/spice-gtk,guodong/spice-gtk,Fantu/spice-gtk,elmarco/spice-gtk,guodong/spice-gtk,fgouget/spice-gtk,elmarco/spice-gtk