vapigen: Support virtual="0"
vapigen: Support virtual="0"

kamanashisroy/aroop,jessevdk/vala,lovebug356/vala,frida/vala,playya/vala,rvu95/vala,severinh/vala,playya/vala,flobrosch/vala-fixes,Distrotech/vala,spidermonkdust/vala,spidermonkdust/vala,Distrotech/vala,tjol/vala-tjol,frida/vala,tjol/vala-tjol,themiwi/vala,frida/vala,rvu95/vala,phako/vala,phako/vala,kamanashisroy/aroop,flobrosch/vala-fixes,jessevdk/vala,Distrotech/vala,Jc2k/vala,severinh/vala,frida/vala,spidermonkdust/vala,GNOME/vala,severinh/vala,rvu95/vala,frida/vala,xdave/pvala,kamanashisroy/aroop,playya/vala,tjol/vala-tjol,Jc2k/vala,GNOME/vala,lovebug356/vala,flobrosch/vala-fixes,GNOME/vala,jessevdk/vala,GNOME/vala,themiwi/vala,themiwi/vala