Remove outdated comment; use boost::detail::iterator_traits instead of

std::iterator_traits exclusively.


[SVN r20117]

libs/iterator

@@ -1 +1 @@
-Subproject commit cbeb7f0632f898e70301b0e92fc9064455c8057e
+Subproject commit 4968b50fc2b47a66da1e8d7459b5fbaa99662480