Restructure the project to match new modular layout.

include/boost/predef/library.h

@@ -0,0 +1,14 @@
+/*
+Copyright Redshift Software, Inc. 2008-2012
+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_PREDEF_LIBRARY_H
+#define BOOST_PREDEF_LIBRARY_H
+
+#include <boost/predef/library/c.h>
+#include <boost/predef/library/std.h>
+
+#endif