Suppress a warning that's in the windows mobile system headers.

[SVN r57963]

hash/test/link_test.cpp

@@ -3,6 +3,8 @@
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
+#include "./config.hpp"
+
 #include <boost/functional/hash.hpp>
 
 extern int f();