girwriter: Properly output variadic methods and use introspectable="0"
girwriter: Properly output variadic methods and use introspectable="0"

This also fixes several criticals caused by "ellipsis" parameter

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