[issue40602] Move Modules/hashtable.h to Include/internal/pycore_hashtable.h

[STINNER Victor]

Change by STINNER Victor <vstinner at python.org>:


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pull_requests: +19365
pull_request: https://github.com/python/cpython/pull/20056

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40602>
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