further ifacecheck fixes (now only 3.3% of documented methods have a wrong signature\!)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56756 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/progdlg.h

@@ -105,7 +105,7 @@ public:
             If "Skip" button was pressed since last Update() call,
             this is set to @true.
     */
-    virtual bool Update(int value, const wxString& newmsg = "",
+    virtual bool Update(int value, const wxString& newmsg = wxEmptyString,
                         bool* skip = NULL);
 };