uucore: optimise run_util_function

[xtqqczze]

No description provided.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/tty/tty-eof. tests/tty/tty-eof is passing on 'main'. Maybe you have to rebase?

[codspeed-hq]

CodSpeed Performance Report

Merging #9964 will degrade performance by 9.19%

_{Comparing xtqqczze:perf/run_util_function (d5bfb75) with main (1eea517)}

Summary

⚡ 1 improvement
❌ 1 regression
✅ 134 untouched
⏩ 24 skipped¹

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

Benchmarks breakdown

	Benchmark	BASE	HEAD	Efficiency
❌	sort_long_line[160000]	1.7 ms	1.8 ms	-9.19%
⚡	mv_force_overwrite	144.3 ms	137.5 ms	+4.97%

Footnotes

1. 24 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. ↩