implement wxWindow::DragAcceptFiles() on all platforms

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56757 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/window.h

@@ -1230,6 +1230,16 @@ public:
         // NULL; it's owned by the window and will be deleted by it)
     virtual void SetDropTarget( wxDropTarget *dropTarget ) = 0;
     virtual wxDropTarget *GetDropTarget() const { return m_dropTarget; }
+
+    // Accept files for dragging
+    virtual void DragAcceptFiles(bool accept)
+#ifdef __WXMSW__
+    // it does have common implementation but not for MSW which has its own
+    // native version of it
+    = 0
+#endif // __WXMSW__
+    ;
+
 #endif // wxUSE_DRAG_AND_DROP
 
     // constraints and sizers