Boost 1.60 compilation fix for OS X
Boost 1.60 compilation fix for OS X

See https://svn.boost.org/trac/boost/ticket/11897 and https://svn.boost.org/trac/boost/ticket/11863

Cherry-picked https://github.com/boostorg/type_traits/commit/f80cbb0dad16f974815a4ad8208f056ec58c9efc

PKRoma/poedit,alexhenrie/poedit,alexhenrie/poedit,c72578/poedit,c72578/poedit,c72578/poedit,PKRoma/poedit,nawawi/poedit,nawawi/poedit,nawawi/poedit,c72578/poedit,vslavik/poedit,nawawi/poedit,alexhenrie/poedit,vslavik/poedit,vslavik/poedit,PKRoma/poedit,vslavik/poedit,alexhenrie/poedit,nawawi/poedit,PKRoma/poedit,alexhenrie/poedit,vslavik/poedit,c72578/poedit,PKRoma/poedit