touch/cp: don't hang preserving timestamps on a FIFO#12758
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filetime::set_file_times opens the file before setting times, which blocks forever on a FIFO with no writer. Add uucore::fs::set_file_times using a path-based utimensat (like GNU), shared by cp and touch.
Use uucore::fs::set_file_times instead of filetime::set_file_times, which opens the destination first and so blocks forever on a FIFO with no writer. Should make test tests/cp/preserve-mode.sh pass
Use uucore::fs::set_file_times instead of filetime, which opens the target first and so blocks forever on a FIFO with no writer. Should make test tests/touch/fifo.sh pass
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