Fix Python 3.8 related deprecation warning  (#600)
Fix Python 3.8 related deprecation warning  (#600)


* per python 3.8: add #define PY_SSIZE_T_CLEAN

add #define PY_SSIZE_T_CLEAN (python 3.8 changes: bpo-36381: Raise ``DeprecationWarning`` when '#' formats are used for building or parsing values without ``PY_SSIZE_T_CLEAN`` (https://docs.python.org/3/whatsnew/3.8.html#changes-in-the-c-api)


pycurl/pycurl,pycurl/pycurl,pycurl/pycurl