[issue40170] [C API] Make PyTypeObject structure an opaque structure in the public C API

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland <erlend.aasland at innova.no>:


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pull_requests: +23331
pull_request: https://github.com/python/cpython/pull/24548

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<https://bugs.python.org/issue40170>
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