Disable strict equality check for undefined values as there
are too many ways the code model just assumes "undefined" as
the information would be present at runtime only or to avoid
too complex evaluation.
Task-number: QTCREATORBUG-25917
Change-Id: I7c6da04f52ba767c4ef5c21078dc14ac4de86687
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>