coreutils: Remove limitation for prefix

[oech3]

Accept ginstall. Actually closes #9237

[codspeed-hq]

Merging this PR will degrade performance by 25%

❌ 8 regressed benchmarks
✅ 274 untouched benchmarks
⏩ 38 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	sort_accented_data[500000]	22.1 MB	28.3 MB	-21.76%
❌	Memory	sort_mixed_data[500000]	22.5 MB	27.2 MB	-17.18%
❌	Memory	sort_long_line[160000]	724.4 KB	965.9 KB	-25%
❌	Memory	sort_ascii_only[500000]	22.2 MB	28.3 MB	-21.74%
❌	Memory	sort_key_field[500000]	45.8 MB	51.7 MB	-11.4%
❌	Memory	sort_case_sensitive[500000]	16.9 MB	17.9 MB	-5.72%
❌	Simulation	cp_large_file[16]	369.8 µs	384.6 µs	-3.85%
❌	Memory	cp_large_file[16]	107.6 KB	116.9 KB	-8%

---

_{Comparing oech3:core-freepfx (084ab30) with main (799de29)}

Footnotes

1. 38 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. ↩

[oech3]

Is performance regression real?

[sylvestre]

Nope. I think we have instabilities with these tests

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/shuf/shuf-reservoir (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/sort/sort-stale-thread-mem (passes in this run but fails in the 'main' branch)