update GVariant bindings
update GVariant bindings

flobrosch/vala-fixes,jessevdk/vala,kamanashisroy/aroop,xdave/pvala,frida/vala,severinh/vala,GNOME/vala,Distrotech/vala,rvu95/vala,GNOME/vala,playya/vala,frida/vala,themiwi/vala,spidermonkdust/vala,jessevdk/vala,playya/vala,themiwi/vala,tjol/vala-tjol,flobrosch/vala-fixes,Distrotech/vala,playya/vala,tjol/vala-tjol,spidermonkdust/vala,kamanashisroy/aroop,frida/vala,severinh/vala,frida/vala,themiwi/vala,GNOME/vala,flobrosch/vala-fixes,frida/vala,jessevdk/vala,kamanashisroy/aroop,Distrotech/vala,tjol/vala-tjol,rvu95/vala,GNOME/vala,spidermonkdust/vala,severinh/vala,rvu95/vala