don't use annoying and unneeded in C++ casts of NULL to "T *" in all other files neither

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58227 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/univ/window.h

@@ -102,7 +102,7 @@ public:
     virtual int GetScrollThumb(int orient) const;
     virtual int GetScrollRange(int orient) const;
     virtual void ScrollWindow(int dx, int dy,
-                              const wxRect* rect = (wxRect *) NULL);
+                              const wxRect* rect = NULL);
 
     // take into account the borders here
     virtual wxPoint GetClientAreaOrigin() const;