avoid locale that always returns US-ASCII on wxMac

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@30600 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/intl.cpp

@@ -2185,6 +2185,9 @@ wxString wxLocale::GetSystemEncodingName()
     // FIXME: what is the error return value for GetACP()?
     UINT codepage = ::GetACP();
     encname.Printf(_T("windows-%u"), codepage);
+#elif defined(__WXMAC__)
+    // default is just empty string, this resolves to the default system
+    // encoding later
 #elif defined(__UNIX_LIKE__)
 
 #if defined(HAVE_LANGINFO_H) && defined(CODESET)