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rust: library: Add `setsid` method to `CommandExt` trait
Add a setsid method to the CommandExt trait so that callers can create a process in a new session and process group whilst still using the POSIX spawn fast path.
Tracking issue: rust-lang/rust#105376
ACP: https://github.com/rust-lang/libs-team/issues/184
This PR was previously submitted by ``@HarveyHunt`` (whom I marked as Co-Author in the commit message) in rust-lang/rust#105377. However that PR went stale.
I applied the [suggestion](231d19fcbf (r1893457943)) to change the function signature to `fn setsid(&mut self, setsid: bool) -> &mut Command`.