girparser: handle multiple identifier-prefixes in namespaces
girparser: handle multiple identifier-prefixes in namespaces

frida/vala,spidermonkdust/vala,rvu95/vala,flobrosch/vala-fixes,GNOME/vala,GNOME/vala,spidermonkdust/vala,frida/vala,frida/vala,GNOME/vala,GNOME/vala,frida/vala,flobrosch/vala-fixes,rvu95/vala,frida/vala,flobrosch/vala-fixes,rvu95/vala,spidermonkdust/vala