With this change we get coverage for namespace related build breakages
in examples of Linux-only modules, such as wayland.

Change-Id: Id9464140059c459a19ce702d6b21a552f8137a2c
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@qt.io>
Reviewed-by: Jędrzej Nowacki <jedrzej.nowacki@qt.io>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>