[Bug 196951] Feature request: fix wait-built to allow waiting for ANY process, not just the current shell's child

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196951

--- Comment #7 from Jilles Tjoelker <jilles at FreeBSD.org> ---
POSIX is clear that wait should report status 127 when a process ID is not a
child of the current shell environment, and I expect that there are scripts
which rely on that.

Apart from that, using the same command with the same syntax to do something
quite different seems confusing.

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