Add Windows-native which command#59
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Adds a small Windows-native
whichimplementation.It searches PATH, respects PATHEXT on Windows, supports
-a/--all, and returns a non-zero exit code when any requested command is not found.This came out of the scope discussion in #56:
whichis common on Unix/macOS and fills a small PowerShell gap without needing a POSIX layer.Validation:
cargo test -p uu_whichcargo checktarget\debug\coreutils.exe which powershell