xargs: add some long options for GNU compatibility
These are low-effort to add, so let's just do it.
Reported by: "LukeShu" on Hacker News (-r / --no-run-if-empty)
MFC after: 1 week
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kevans Authored on Sep 21 2020, 5:06 PM - Parents
- rG895a7e604db4: Pull in fix from upstream NetBSD rev. 1.5:
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