Fix Py_CLEAR/Py_SETREF macros for C++

Replace "_Py_TYPEOF(dst)*" with "_Py_TYPEOF(&(dst))". In C++,
"_Py_TYPEOF(dst)*" can fail with a compiler error.

Author: vstinner

Include/cpython/object.h

@@ -352,7 +352,7 @@ PyAPI_FUNC(PyObject *) _PyObject_FunctionStr(PyObject *);
 #ifdef _Py_TYPEOF
 #define Py_SETREF(dst, src) \
     do { \
-        _Py_TYPEOF(dst)* _tmp_dst_ptr = &(dst); \
+        _Py_TYPEOF(&(dst)) _tmp_dst_ptr = &(dst); \
         _Py_TYPEOF(dst) _tmp_old_dst = (*_tmp_dst_ptr); \
         *_tmp_dst_ptr = (src); \
         Py_DECREF(_tmp_old_dst); \
@@ -374,7 +374,7 @@ PyAPI_FUNC(PyObject *) _PyObject_FunctionStr(PyObject *);
 #ifdef _Py_TYPEOF
 #define Py_XSETREF(dst, src) \
     do { \
-        _Py_TYPEOF(dst)* _tmp_dst_ptr = &(dst); \
+        _Py_TYPEOF(&(dst)) _tmp_dst_ptr = &(dst); \
         _Py_TYPEOF(dst) _tmp_old_dst = (*_tmp_dst_ptr); \
         *_tmp_dst_ptr = (src); \
         Py_XDECREF(_tmp_old_dst); \

Include/refcount.h

@@ -482,7 +482,7 @@ static inline Py_ALWAYS_INLINE void Py_DECREF(PyObject *op)
 #ifdef _Py_TYPEOF
 #define Py_CLEAR(op) \
     do { \
-        _Py_TYPEOF(op)* _tmp_op_ptr = &(op); \
+        _Py_TYPEOF(&(op)) _tmp_op_ptr = &(op); \
         _Py_TYPEOF(op) _tmp_old_op = (*_tmp_op_ptr); \
         if (_tmp_old_op != _Py_NULL) { \
             *_tmp_op_ptr = _Py_NULL; \