use const wxMBConv& instead of wxMBConv& in public methods so that it's possible to pass in temporary objects;

don't use global wxConvUTF8 object internally, it may be unavailable at static objects destruction time


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45973 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/archive.h

@@ -341,6 +341,8 @@ public:
         const wxString& name,
         wxPathFormat format = wxPATH_NATIVE) const = 0;
 
+    // FIXME-UTF8: remove these from this file, they are used for ANSI
+    //             build only
     void SetConv(wxMBConv& conv) { m_pConv = &conv; }
     wxMBConv& GetConv() const
         { if (m_pConv) return *m_pConv; else return wxConvLocal; }