[boost] [1.35.0][multi_index] merge request

Hello, I'm asking for permission to merge rev. 41397 of multi_index from the trunk to the release branch: http://svn.boost.org/trac/boost/changeset/41397 This fix makes the lib usable for IBM XL C/C++ (VisualAge) V8.0, and introduces no regressions in other environments, see http://beta.boost.org/development/tests/trunk/developer/multi_index.html Thank you, Joaquín M López Muñoz Telefónica, Investigación y Desarrollo