bpo-45476: Add _Py_RVALUE() macro #29860
                
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Add a new _Py_RVALUE() macro to prevent using an expression as an
l-value.
Replace a "(void)" cast with the _Py_RVALUE() macro in the following
macros:
Add also parentheses around macro arguments in PyCell_SET() and
PyTuple_SET_ITEM().
https://bugs.python.org/issue45476