Fix "Warning: Class ToolBox implements the interface QGraphicsItem but does not list it in Q_INTERFACES. qobject_cast to QGraphicsItem will not work!" with qt-4.6

svn path=/trunk/KDE/kdelibs/; revision=1025997

private/applethandle_p.h

@@ -39,6 +39,9 @@ class View;
 class AppletHandle : public QObject, public QGraphicsItem
 {
     Q_OBJECT
+#if QT_VERSION >= 0x040600
+    Q_INTERFACES(QGraphicsItem)
+#endif	    
     public:
         enum FadeType {
             FadeIn,

private/toolbox_p.h

@@ -40,7 +40,9 @@ class ToolBoxPrivate;
 class ToolBox : public QObject, public QGraphicsItem
 {
     Q_OBJECT
-
+#if QT_VERSION >= 0x040600
+    Q_INTERFACES(QGraphicsItem)
+#endif
 public:
     /**
     * These flags represents what borders should be drawn