compilation fix for wxUniv after last commit

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45204 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/window.h

@@ -160,7 +160,7 @@ public:
     // that the window object is passed instead of window handle) and should
     // return true if it handled the message or false if it should be passed to
     // DefWindowProc()
-    typedef bool (*MSWMessageHandler)(wxWindow *win,
+    typedef bool (*MSWMessageHandler)(wxWindowMSW *win,
                                       WXUINT nMsg,
                                       WXWPARAM wParam,
                                       WXLPARAM lParam);