KSVG: fix to include classes used in TQPtrList

It must be included, or its destructor may not be used in PtrList maitainance.

Signed-off-by: OBATA Akio <obache@wizdas.com>

ksvg/core/KSVGCanvas.h

@@ -30,6 +30,8 @@
 
 #include <Converter.h>
 
+#include <CanvasItem.h>
+
 namespace KSVG
 {
 
@@ -49,8 +51,6 @@ class SVGPolygonElementImpl;
 class SVGPolylineElementImpl;
 class SVGClipPathElementImpl;
 
-class CanvasItem;
-class CanvasChunk;
 class CanvasItemList;
 class CanvasClipPath;
 class CanvasPaintServer;