[issue39573] [C API] Make PyObject an opaque structure in the limited C API

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

To port code to Python 3.10, the following macro can be copied/pasted in your code. It defines Py_SET_SIZE() if it's not defined.

#if PY_VERSION_HEX < 0x030900A4
#  define Py_SET_SIZE(obj, size) do { Py_SIZE(obj) = (size); } while (0)
#endif

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<https://bugs.python.org/issue39573>
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