don't use implicit wxString->char*/wchar_t* conversion, it will not be available in wxUSE_STL build in the future

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@46391 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/xml/xml.cpp

@@ -558,8 +558,7 @@ static int UnknownEncodingHnd(void * WXUNUSED(encodingHandlerData),
     // We must build conversion table for expat. The easiest way to do so
     // is to let wxCSConv convert as string containing all characters to
     // wide character representation:
-    wxString str(name, wxConvLibc);
-    wxCSConv conv(str.c_str());
+    wxCSConv conv(name);
     char mbBuf[2];
     wchar_t wcBuf[10];
     size_t i;