Fix waf --generate-version bug since waf upgrade
Fix waf --generate-version bug since waf upgrade

cawka/pybindgen,cawka/pybindgen,cawka/pybindgen,cawka/pybindgen,caramucho/pybindgen,caramucho/pybindgen,caramucho/pybindgen,caramucho/pybindgen