girparser: Support unnamed arguments for all types
girparser: Support unnamed arguments for all types

Fixes bug 636996.

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