Another attempt at a compilation fix for VC++ 5 and 6

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@34067 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/window.h

@@ -50,6 +50,9 @@ class WXDLLEXPORT wxWindowMSW : public wxWindowBase
     friend class wxSpinCtrl;
     friend class wxSlider;
     friend class wxRadioBox;
+#if defined __VISUALC__ && __VISUALC__ <= 1200
+    friend class wxWindowMSW;
+#endif
 public:
     wxWindowMSW() { Init(); }