Try to fix compilation for old Qt 5 versions for Visual Studio

Author: usiems

generator/parser/codemodel.h

@@ -44,12 +44,12 @@
 
   #include "codemodel_fwd.h"
 
-  #include <QtCore/QHash>
-  #include <QtCore/QList>
-  #include <QtCore/QString>
-  #include <QtCore/QStringList>
-  #include <QtCore/QVector>
-  #include <QtCore/QSet>
+  #include <QString>
+  #include <QStringList>
+  #include <QList>
+  #include <QHash>
+  #include <QVector>
+  #include <QSet>
   #include <QSharedPointer>
 
   #define DECLARE_MODEL_NODE(k) enum { __node_kind = Kind_##k };