girparser: Add required copy/free attributes for gtype-boxed structs
girparser: Add required copy/free attributes for gtype-boxed structs

See https://gitlab.gnome.org/GNOME/vala/issues/863

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