fix read/write/header callback return values, should no longer assume that return size is an int instead of size_t
fix read/write/header callback return values, should no longer assume that
return size is an int instead of size_t

pycurl/pycurl,p/pycurl-archived,p/pycurl-archived,pycurl/pycurl,p/pycurl-archived,pycurl/pycurl