mods to boost intrusive

* Fixes [#9332](https://svn.boost.org/trac/boost/ticket/9332)
* Patch from [this commit](https://github.com/smanders/boost-trunk/commit/53526d6fbcd668c246d1a4365bd4ada8093c9194)
* Also [svn](https://svn.boost.org/trac/boost/changeset/86626) and [git modularized boost](https://github.com/boostorg/intrusive/commit/2b34e74562ed3f004371d85daf31736cf39d74a6)