install: show backup failure causes#13349
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Fixes #13165.
When the backup target is a directory,
install --backupdiscarded therenameerror and reported only a generic backup failure.Preserve and display the underlying I/O error, matching GNU's diagnostic.
strip_errnoremoves Rust's platform-specific(os error N)suffix.Add a cross-platform regression test that derives the expected error text from the platform's
renamefailure.