tail: replace unsafe libc::kill by rustix#11725
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Use `rustix::process::test_kill_process` (a safe wrapper around `kill(pid, 0)`) to eliminate the remaining `unsafe` blocks in src/uu/tail/src/platform/unix.rs. This removes the direct `libc::kill` calls and the `get_errno` helper, replacing them with idiomatic `match` on `rustix::io::Errno` variants.
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Summary
unsafe { libc::kill(pid, 0) }calls with the saferustix::process::test_kill_processAPIget_errnohelper andstd::io::Errorimport, usingmatchonrustix::io::Errnovariants insteadprocessfeature to the existingrustixdependency inuu_tail/Cargo.tomlThis eliminates all
unsafeblocks fromsrc/uu/tail/src/platform/unix.rs.