Introduce a new SysProcAttr member called Jail on FreeBSD. This allows
supplying an existing jail's ID to which the child process is attached
before calling the exec system call.
Fixes #46259
Change-Id: Ie282e5b83429131f9a9e1e27cfcb3bcc995d1d4d
Reviewed-on: https://go-review.googlesource.com/c/go/+/458335
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Auto-Submit: Ian Lance Taylor <iant@google.com> Reviewed-by: Samuel Karp <samuelkarp@google.com>
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