QtDeclarative: Marke WinCE as forcesuccess for now

The 'dev' branch was marked as forcesuccess, so after the merge from
dev->stable the stable branch got broken.

This is a temporary solution to unblock the CI.

Change-Id: I8606729166aaa3a70f2c60c4db701f7e48d626f3
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>