Make bind.hpp and mem_fn.hpp forward to bind/bind.hpp and bind/mem_fn.hpp. (Ref #2238)

[SVN r51489]

include/boost/bind/bind.hpp

@@ -1,5 +1,5 @@
-#ifndef BOOST_BIND_HPP_INCLUDED
-#define BOOST_BIND_HPP_INCLUDED
+#ifndef BOOST_BIND_BIND_HPP_INCLUDED
+#define BOOST_BIND_BIND_HPP_INCLUDED
 
 // MS compatible compilers support #pragma once
 
@@ -1716,4 +1716,4 @@ BOOST_BIND( M T::*f, A1 a1 )
 # pragma warning(pop)
 #endif
 
-#endif // #ifndef BOOST_BIND_HPP_INCLUDED
+#endif // #ifndef BOOST_BIND_BIND_HPP_INCLUDED