Integrated the not yet accepted boost::nowide library, thanks @alexrj.

xs/src/boost/nowide/config.hpp

@@ -0,0 +1,54 @@
+//
+//  Copyright (c) 2012 Artyom Beilis (Tonkikh)
+//
+//  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)
+//
+#ifndef BOOST_NOWIDE_CONFIG_HPP_INCLUDED
+#define BOOST_NOWIDE_CONFIG_HPP_INCLUDED
+
+#include <boost/config.hpp>
+
+#ifndef BOOST_SYMBOL_VISIBLE
+# define BOOST_SYMBOL_VISIBLE
+#endif
+
+#ifdef BOOST_HAS_DECLSPEC 
+#   if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_NOWIDE_DYN_LINK)
+#       ifdef BOOST_NOWIDE_SOURCE
+#           define BOOST_NOWIDE_DECL BOOST_SYMBOL_EXPORT
+#       else
+#           define BOOST_NOWIDE_DECL BOOST_SYMBOL_IMPORT
+#       endif  // BOOST_NOWIDE_SOURCE
+#   endif  // DYN_LINK
+#endif  // BOOST_HAS_DECLSPEC
+
+#ifndef BOOST_NOWIDE_DECL
+#   define BOOST_NOWIDE_DECL
+#endif
+
+//
+// Automatically link to the correct build variant where possible. 
+// 
+#if !defined(BOOST_ALL_NO_LIB) && !defined(BOOST_NOWIDE_NO_LIB) && !defined(BOOST_NOWIDE_SOURCE)
+//
+// Set the name of our library, this will get undef'ed by auto_link.hpp
+// once it's done with it:
+//
+#define BOOST_LIB_NAME boost_nowide
+//
+// If we're importing code from a dll, then tell auto_link.hpp about it:
+//
+#if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_NOWIDE_DYN_LINK)
+#  define BOOST_DYN_LINK
+#endif
+//
+// And include the header that does the work:
+//
+#include <boost/config/auto_link.hpp>
+#endif  // auto-linking disabled
+
+
+#endif // boost/nowide/config.hpp
+// vim: tabstop=4 expandtab shiftwidth=4 softtabstop=4