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

[STINNER Victor]

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

numpy fix defines Py_SET_TYPE() and Py_SET_SIZE() on old Python versions:

* https://github.com/numpy/numpy/commit/a96b18e3d4d11be31a321999cda4b795ea9eccaa
* https://github.com/numpy/numpy/pull/16417

In the whole numpy code base, only 5 lines have to be modified!

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