[issue46398] posixshmem module shm_rename freebsd support.

[David CARLIER]

New submission from David CARLIER <devnexen at gmail.com>:

- Adding shm_rename (from FreeBSD 13) to be able to move a shared memory block from one location to another.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46398>
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