[issue18049] Re-enable threading test on macOS

[Ronald Oussoren]

Ronald Oussoren <ronaldoussoren at mac.com> added the comment:

@Michael: The relevant code is in Python/thread_pthread.h:  https://github.com/python/cpython/blob/bf8162c8c45338470bbe487c8769bba20bde66c2/Python/thread_pthread.h#L34

There are already blocks for macOS and FreeBSD, adding a block for AIX should be easy enough. I don't know what a good size for the stack would be though, the macOS size is large enough to not cause crashes with the default recursion limit in debug builds and was experimentally determined.

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