Issue #13706: Fix format(int, "n") for locale with non-ASCII thousands separator

 * Decode thousands separator and decimal point using PyUnicode_DecodeLocale()
   (from the locale encoding), instead of decoding them implicitly from latin1
 * Remove _PyUnicode_InsertThousandsGroupingLocale(), it was not used
 * Change _PyUnicode_InsertThousandsGrouping() API to return the maximum
   character if unicode is NULL
 * Replace MIN/MAX macros by Py_MIN/Py_MAX
 * stringlib/undef.h undefines STRINGLIB_IS_UNICODE
 * stringlib/localeutil.h only supports Unicode
diff --git a/Objects/stringlib/undef.h b/Objects/stringlib/undef.h
index fd87e56..9310204 100644
--- a/Objects/stringlib/undef.h
+++ b/Objects/stringlib/undef.h
@@ -7,5 +7,5 @@
 #undef  STRINGLIB_NEW
 #undef  STRINGLIB_RESIZE
 #undef  _Py_InsertThousandsGrouping
-#undef  _Py_InsertThousandsGroupingLocale
+#undef STRINGLIB_IS_UNICODE