girparser: Add support for bool delegate_target
girparser: Add support for bool delegate_target

https://gitlab.gnome.org/GNOME/vala/issues/520

frida/vala,frida/vala,GNOME/vala,GNOME/vala,frida/vala,GNOME/vala,frida/vala,frida/vala,GNOME/vala