Add bindings to GLib.Once
Add bindings to GLib.Once

spidermonkdust/vala,GNOME/vala,playya/vala,spidermonkdust/vala,spidermonkdust/vala,flobrosch/vala-fixes,Distrotech/vala,frida/vala,playya/vala,flobrosch/vala-fixes,frida/vala,rvu95/vala,rvu95/vala,GNOME/vala,Distrotech/vala,flobrosch/vala-fixes,frida/vala,GNOME/vala,xdave/pvala,Distrotech/vala,rvu95/vala,playya/vala,GNOME/vala,frida/vala,frida/vala