The test use aggregate initialization on some classes which however
are no longer aggregates in C++20 (the rules changed again; in C++20
having a user-*declared* constructor makes a class not an aggregate).
Just add a constructor so the code keeps compiling in both 17 and 20.
Fixes: QTBUG-92963
Pick-to: 6.0 6.1
Change-Id: I52371c5ee34c84358987b5ae8bee9ab9c49c8eab
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
7cdf77f5e7