Changed code generation for form classes to do a Qt version check

Change-Id: I20200303ef68bc3e73b232c44263d71d09b091a5
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@nokia.com>
Reviewed-by: Bill King <bill.king@nokia.com>

src/plugins/designer/qtdesignerformclasscodegenerator.h

@@ -65,6 +65,7 @@ struct FormClassWizardGenerationParameters
     UiClassEmbedding embedding;
     bool retranslationSupport; // Add handling for language change events
     bool includeQtModule; // Include "<QtGui/[Class]>" or just "<[Class]>"
+    bool addQtVersionCheck; // Include #ifdef when using "#include <QtGui/..."
     bool indentNamespace;
 };