[issue35081] Move internal headers to Include/internal/

[Stefan Behnel]

Stefan Behnel <stefan_ml at behnel.de> added the comment:

Making _PyGC_FINALIZED() internal broke Cython (https://github.com/cython/cython/issues/2721). It's used in the finaliser implementation (https://github.com/cython/cython/blob/da657c8e326a419cde8ae6ea91be9661b9622504/Cython/Compiler/ModuleNode.py#L1442-L1456), to determine if an object for which tp_dealloc() is called has already been finalised or whether we have to do it. I'm not sure how to deal with this on our side now. Any clue?

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nosy: +scoder

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