Merged changeset 86412 from trunk.
Fixes #9286



git-svn-id: http://svn.boost.org/svn/boost/branches/release@86424 b8fc166d-592f-0410-95f2-cb63ce0dd405
merge [86344] from trunk

git-svn-id: http://svn.boost.org/svn/boost/branches/release@86427 b8fc166d-592f-0410-95f2-cb63ce0dd405
Merge from trunk, thus enabling support for VC++ 2013.

git-svn-id: http://svn.boost.org/svn/boost/branches/release@86432 b8fc166d-592f-0410-95f2-cb63ce0dd405