updated for version 7.3.661

Problem:    SEGV in Python code.
Solution:   Initialize len to zero.  Use the right function depending on
            version. (Maxim Philippov)

src/if_py_both.h

@@ -74,7 +74,7 @@ static struct PyMethodDef OutputMethods[] = {
     static PyObject *
 OutputWrite(PyObject *self, PyObject *args)
 {
-    Py_ssize_t len;
+    Py_ssize_t len = 0;
     char *str = NULL;
     int error = ((OutputObject *)(self))->error;