This commit was manufactured by cvs2svn to create branch 'RC_1_31_0'.

svn path=/branches/RC_1_31_0/boost/boost/bind/; revision=21427
Unfix unversioned VC++ check again, VC 7.1 still needs it.

svn path=/branches/RC_1_31_0/boost/boost/bind/; revision=22378