du: Allow command-line argument that appears more than once

[ajanicij]

Fix for 1173: du: error: the argument '--human-readable' cannot be used multiple times (but works in GNU).

• For du command, accept a repeated command-line argument wherever it makes sense.

[ajanicij]

I discovered from the CI/CD test that NO_DEREFERENCE was correct to begin with. Undid my "fix".

[sylvestre]

please add a test that verify all these changes to make sure we don't regress in the future

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/date/date-locale-hour (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/rm/isatty (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/cut/bounded-memory (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/tail/inotify-dir-recreate (passes in this run but fails in the 'main' branch)

[codspeed-hq]

Merging this PR will improve performance by 3.02%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

⚡ 1 improved benchmark
✅ 308 untouched benchmarks
⏩ 46 skipped benchmarks¹

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	du_max_depth_balanced_tree[(6, 4, 10)]	25.8 ms	25 ms	+3.02%

---

_{Comparing ajanicij:ajanicij/du-accept-repeated-argument (d21d3b6) with main (34fd4be)}

Footnotes

1. 46 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[sylvestre]

thanks