mkfifo: drop path-based chmod to close TOCTOU race (#10020)

[sylvestre]

No description provided.

[github-actions]

GNU testsuite comparison:

Congrats! The gnu test tests/cut/cut-huge-range is now passing!
Note: The gnu test tests/misc/write-errors was skipped on 'main' but is now failing.
Skip an intermittent issue tests/tail/tail-n0f (was skipped on 'main', now failing)

[codspeed-hq]

Merging this PR will not alter performance

✅ 323 untouched benchmarks
⏩ 46 skipped benchmarks¹

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_{Comparing sylvestre:toctou-mkfifo (f5cb691) with main (4353689)}

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. ↩

[RenjiSann]

Ci is sad :/

[RenjiSann]

There are still some CI fails, looks like missing spell ignore