[cmake] Fix detection for Boost Python 1.59.0 workaround
[cmake] Fix detection for Boost Python 1.59.0 workaround

afh/ledger,afh/ledger,afh/ledger,afh/ledger,ledger/ledger,ledger/ledger,ledger/ledger,afh/ledger,ledger/ledger,ledger/ledger