trying to fix dmc warning about potential overload ambiguity

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32471 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/filename.h

@@ -424,7 +424,7 @@ public:
                           wxString *path,
                           wxString *name,
                           wxString *ext,
-                          wxPathFormat format = wxPATH_NATIVE)
+                          wxPathFormat format)
     {
         SplitPath(fullpath, volume, path, name, ext, NULL, format);
     }