Spell address with two d's. Inspired by similar changes in OpenBSD,
originating from Jonathon Gray and forwarded by jmc@openbsd.

Move Keith Muller's code from a 4-clause to a 3-clause licence by removing
the advertising clause. Diffs provided in PR 22397 by Joel Baker, confirmed
to the board by Keith Muller.

Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22280, verified by myself.

Clarify the cache size description comments a little.

Import the version from pax(1), with a few changes:
* Functions renamed to match libc interface.
* Fixed to actually put entries into the hash tables!
* Different hash function, simpler but with the

Import the version from pax(1), with a few changes:
* Functions renamed to match libc interface.
* Fixed to actually put entries into the hash tables!
* Different hash function, simpler but with the same distribution.

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