[Bug 283355] install: -U does not validate -o and -g values

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283355

--- Comment #2 from Pat Maddox <pat@patmaddox.com> ---
I agree that these should not be validated. This PR is in response to this
comment:
https://github.com/freebsd/freebsd-src/pull/1550#issuecomment-2543992885

As mentioned in my reply
(https://github.com/freebsd/freebsd-src/pull/1550#issuecomment-2543997101) I
think it's reasonable to set uid / gid values that may not be on the builder
machine, but will be present on the installed machine.

Plus there's the reality that chown / chgrp let you set any ID, even if it
doesn't correspond to a user in /etc/passwd.

Thus I don't see any reason why install should validate uid / gid semantically
(i.e. known on the present machine). Ensuring that they are within acceptable
ranges seems reasonable to me.

Jessica Clarke has expressed a clear preference for validating (it was a few
months ago, things may have changed since). I'm not sure how a conversation
like this proceeds.

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