use UTF8-encoded char* strings in UTF8 build instead of wchar_t* if the current locale uses UTF8;

fall back to widechar CRT functions in the locale is not UTF8


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@45663 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/msgout.cpp

@@ -76,7 +76,7 @@ wxMessageOutput* wxMessageOutput::Set(wxMessageOutput* msgout)
     return old;
 }
 
-void wxMessageOutput::DoPrintf(const wxChar* format, ...)
+void wxMessageOutput::DoPrintf(const wxString& format, ...)
 {
     va_list args;
     va_start(args, format);