cksum: disable a broken benchmark

[oech3]

No description provided.

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/tty/tty-eof (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/seq/seq-epipe is now passing!

[codspeed-hq]

Merging this PR will degrade performance by 14.62%

⚡ 4 improved benchmarks
❌ 8 regressed benchmarks
✅ 290 untouched benchmarks
⏩ 44 skipped benchmarks¹

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

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	sort_numeric[500000]	1 s	1 s	+3.28%
⚡	Simulation	seq_custom_separator	29.3 ms	27.6 ms	+6.15%
⚡	Simulation	seq_integers	26.6 ms	24.9 ms	+6.81%
⚡	Simulation	seq_with_step	13.5 ms	12.7 ms	+6.82%
❌	Simulation	fold_custom_width[50000]	24.3 ms	25.3 ms	-4.03%
❌	Simulation	fold_many_lines[100000]	61.8 ms	63.8 ms	-3.18%
❌	Simulation	true_consecutive_calls	170.3 ns	199.4 ns	-14.62%
❌	Simulation	false_consecutive_calls	170.3 ns	199.4 ns	-14.62%
❌	Simulation	unexpand_large_file[10]	281.5 ms	302.2 ms	-6.86%
❌	Simulation	unexpand_many_lines[100000]	134.4 ms	144.3 ms	-6.86%
❌	Simulation	expand_custom_tabstops[50000]	16.6 ms	17.7 ms	-6.38%
❌	Simulation	expand_many_lines[100000]	64.6 ms	68.4 ms	-5.44%

---

_{Comparing oech3:patch-1 (2eb338c) with main (9654e4a)}

Footnotes

1. 44 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. ↩

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/seq/seq-epipe. tests/seq/seq-epipe is passing on 'main'. Maybe you have to rebase?
Congrats! The gnu test tests/cut/bounded-memory is now passing!

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/misc/io-errors. tests/misc/io-errors is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/date/date-locale-hour (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/date/resolution (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/tail/pipe-f is now being skipped but was previously passing.