Move BOOST_HASH_CHAR_TRAITS from container_fwd into the hash headers, and undefine it.

[SVN r54143]

include/boost/functional/hash/hash.hpp

@@ -21,6 +21,12 @@
 #include <boost/type_traits/is_pointer.hpp>
 #endif
 
+#if BOOST_WORKAROUND(__GNUC__, < 3) && !defined(__SGI_STL_PORT) && !defined(_STLPORT_VERSION)
+#define BOOST_HASH_CHAR_TRAITS string_char_traits
+#else
+#define BOOST_HASH_CHAR_TRAITS char_traits
+#endif
+
 namespace boost
 {
     std::size_t hash_value(bool);
@@ -534,6 +540,8 @@ namespace boost
 #endif
 }
 
+#undef BOOST_HASH_CHAR_TRAITS
+
 #endif // BOOST_FUNCTIONAL_HASH_HASH_HPP
 
 // Include this outside of the include guards in case the file is included