Qt3D, QtWebEngine: set some configs enforcing

These are passing.  Make sure they stay that way.

Change-Id: Iad3dadd76693778aff6661a9f7949b68f2461721
Reviewed-by: Jocelyn Turcotte <jocelyn.turcotte@digia.com>
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>
Reviewed-by: Tony Sarajärvi <tony.sarajarvi@digia.com>