locale.rs: fix a cfg with collapsible_if

[oech3]

No description provided.

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Note: The gnu test tests/printf/printf-surprise is now being skipped but was previously passing.
Congrats! The gnu test tests/pr/bounded-memory is now passing!

[codspeed-hq]

Merging this PR will degrade performance by 5.31%

⚠️ 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

⚡ 4 improved benchmarks
❌ 6 regressed benchmarks
✅ 299 untouched benchmarks
⏩ 46 skipped benchmarks¹

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

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Simulation	fold_many_lines[100000]	63.8 ms	57.3 ms	+11.41%
⚡	Simulation	fold_custom_width[50000]	25.3 ms	22.9 ms	+10.22%
❌	Simulation	nl_many_lines[100000]	18.9 ms	19.6 ms	-3.68%
❌	Simulation	nl_large_file[10]	24.1 ms	25 ms	-3.73%
❌	Simulation	cksum_sha224	1.7 s	1.8 s	-4.05%
⚡	Simulation	cksum_blake2b	192.7 ms	183.8 ms	+4.86%
❌	Simulation	cksum_sha256	1.7 s	1.8 s	-4.04%
❌	Simulation	cksum_crc32b	13 ms	13.7 ms	-5.31%
❌	Simulation	cksum_sha2	1.7 s	1.8 s	-4.04%
⚡	Simulation	split_bytes	401.8 µs	389.7 µs	+3.08%

---

_{Comparing oech3:cif-cfg (28745e0) with main (5b54e08)}

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. ↩