Compile fix with current qtbase/dev

Change-Id: I6fdb6429e8509468b7a710414af250ea6464d92d
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

plugins/autotest/testresult.h

@@ -21,6 +21,7 @@
 
 #include <QString>
 #include <QColor>
+#include <QMetaType>
 
 namespace Autotest {
 namespace Internal {