Use wchar_t functions in _locale module.
diff --git a/pyconfig.h.in b/pyconfig.h.in
index df0a6d9..1a0460d 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -776,6 +776,9 @@
 /* Define to 1 if you have the `wcscoll' function. */
 #undef HAVE_WCSCOLL
 
+/* Define to 1 if you have the `wcsxfrm' function. */
+#undef HAVE_WCSXFRM
+
 /* Define if tzset() actually switches the local timezone in a meaningful way.
    */
 #undef HAVE_WORKING_TZSET