girparser: add special case for GPtrArray and GArray
girparser: add special case for GPtrArray and GArray

Fixes bug 618660.

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