GeezerVison

Using MSVC (on Windows), _Py_TYPEOF() prefers decltype()
over __typeof__() on C++.

Fix also _Py_TYPEOF() usage in Py_CLEAR() and Py_SETREF() macros.
Replace "_Py_TYPEOF(dst)*" with "_Py_TYPEOF(&(dst))". In C++,
"_Py_TYPEOF(dst)*" can fail with a compiler error.

(cherry picked from commit bba99f2)

On C++, do not use decltype() in _Py_TYPEOF since it produces invalid
code in Py_CLEAR() and Py_SETREF(). Instead, implement Py_CLEAR(),
Py_SETREF() and Py_XSETREF() using "auto" on C++11 and newer.

Add Py_CLEAR(), Py_SETREF() and Py_XSETREF() tests on an array.

(cherry picked from commit 3330712)