ipcrm(1) on OpenBSD

The text 7059350963bd, as OpenBSD 5.5, OpenBSD 5.4, OpenBSD 5.3, OpenBSD 5.2, OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9 shipped it.

remove the specified message queues, semaphore sets, and shared memory segments

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