cp: remove feat_acl & exacl

[oech3]

Fixes #13056 . xattr is already dep of rustix. We already do copy_acls.

[sylvestre]

a bunch of jobs are failing

[oech3]

yes. I was missing cfg

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/inotify-dir-recreate (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/tail/symlink (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/tail/tail-n0f is now being skipped but was previously passing.

[oech3]

I gated code with same targets supported by exacl.

[oech3]

We already do copy_acls. Can we just remove exacl?

[codspeed-hq]

Merging this PR will degrade performance by 3.06%

⚠️ 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 regressed benchmark
✅ 346 untouched benchmarks
⏩ 46 skipped benchmarks¹

Warning

Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	du_max_depth_balanced_tree[(6, 4, 10)]	60.7 ms	62.6 ms	-3.06%

Tip

Investigate this regression by commenting @codspeedbot fix this regression on this PR, or directly use the CodSpeed MCP with your agent.

---

_{Comparing oech3:cp-attr (d3d6062) with main (fe9420b)²}

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. ↩

2. No successful run was found on main (89bdbb8) during the generation of this report, so fe9420b was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩

[cakebaker]

Thanks!