gcc ADL fixes

[SVN r17811]

include/boost/mpl/remove_if.hpp

@@ -45,6 +45,8 @@ template< typename Pred > struct remove_if_helper
 
 } // namespace aux
 
+BOOST_MPL_AUX_AGLORITHM_NAMESPACE_BEGIN
+
 template<
       typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Sequence)
     , typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Predicate)
@@ -62,7 +64,9 @@ struct remove_if
         >::type type;
 };
 
-BOOST_MPL_AUX_VOID_SPEC(2, remove_if)
+BOOST_MPL_AUX_AGLORITHM_NAMESPACE_END
+
+BOOST_MPL_AUX_ALGORITHM_VOID_SPEC(2, remove_if)
 
 } // namespace mpl
 } // namespace boost