We already had code to handle attributes on funtcions, but we didn't
handle them correctly for classes so far.
Fix this by simply skipping over the attribute.
Fixes: QTBUG-105310
Pick-to: 5.15 6.2 6.3 6.4
Change-Id: Ic4149f940e74820de4f2fa9540d9dc5b4e626a3a
Reviewed-by: Marc Mutz <marc.mutz@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>