Continue to allow code to build with older Boost.Python libs. #6759
Continue to allow code to build with older Boost.Python libs. #6759

Specifically, try to avoid using APIs that require a newer Boost
library than is available in packages for Centos.

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor