girparser: Report error on unsupported GIR version
girparser: Report error on unsupported GIR version

Fixes bug 629805.

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