following MODPY_BIN_SUFFIX switch the "cython" command is renamed to cython-2 for the py2 version - the py3 build of cython is happy to work with code from a py2 port.
following MODPY_BIN_SUFFIX switch the "cython" command is renamed to cython-2 for the py2 version - the py3 build of cython is happy to work with code from a py2 port.