rdsetroot(8) on OpenBSD

The text 552972befe1b, as OpenBSD 7.2, OpenBSD 7.1, OpenBSD 7.0, OpenBSD 6.9, OpenBSD 6.8, OpenBSD 6.7, OpenBSD 6.6, OpenBSD 6.5 shipped it.

insert disk image into RAMDISK kernel

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