bpo-1635741: Port _ctypes_test extension to multiphase initialization (PEP 489) (GH-19012)

Author: shihai1991

Modules/_ctypes/_ctypes_test.c

@@ -1032,14 +1032,17 @@ EXPORT (HRESULT) KeepObject(IUnknown *punk)
 
 #endif
 
+static struct PyModuleDef_Slot _ctypes_test_slots[] = {
+    {0, NULL}
+}; 
 
 static struct PyModuleDef _ctypes_testmodule = {
     PyModuleDef_HEAD_INIT,
     "_ctypes_test",
     NULL,
-    -1,
+    0,
     module_methods,
-    NULL,
+    _ctypes_test_slots,
     NULL,
     NULL,
     NULL
@@ -1048,5 +1051,5 @@ static struct PyModuleDef _ctypes_testmodule = {
 PyMODINIT_FUNC
 PyInit__ctypes_test(void)
 {
-    return PyModule_Create(&_ctypes_testmodule);
+    return PyModuleDef_Init(&_ctypes_testmodule);
 }