Tests: Compile fix for dumper test using Qt4 on Win

Task-number: QTCREATORBUG-9719
Change-Id: Ie4024a8c08e0612e3c37888c7bc45415922228af
Reviewed-by: Robert Loehning <robert.loehning@digia.com>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>