gcc ADL fixes

[SVN r17811]

include/boost/mpl/remove.hpp

@@ -24,6 +24,8 @@
 namespace boost {
 namespace mpl {
 
+BOOST_MPL_AUX_AGLORITHM_NAMESPACE_BEGIN
+
 template<
       typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Sequence)
     , typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T)
@@ -33,7 +35,9 @@ struct remove
 {
 };
 
-BOOST_MPL_AUX_VOID_SPEC(2, remove)
+BOOST_MPL_AUX_AGLORITHM_NAMESPACE_END
+
+BOOST_MPL_AUX_ALGORITHM_VOID_SPEC(2, remove)
 
 } // namespace mpl
 } // namespace boost