Make rustix::io::stdout a safe function, in std mode.
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Revisit the safety considerations of `rustix::io::stdout` and friends. The Rust standard library assumes that the stdin, stdout, and stderr file descriptors are always open, to the point where it's even willing to hand out a [`'static` borrow for them]. Consequently, rustix doesn't need to treat these as unsafe when std is in use. [`'static` borrow for them]: https://doc.rust-lang.org/stable/std/io/struct.Stdin.html#method.lock
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Revisit the safety considerations of
rustix::io::stdoutand friends. The Rust standard library assumes that the stdin, stdout, and stderr file descriptors are always open, to the point where it's even willing to hand out a'staticborrow for them. Consequently, rustix doesn't need to treat these as unsafe when std is in use.