These are experimental anyway, and to be used they have to be explicitly
imported or added in a pro file.

Change-Id: I7ab4391db5d3f22d8cd4c1819ca0610b8739ff7f
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io>
Reviewed-by: BogDan Vatra <bogdan@kdab.com>