Task 61902550085

ci, iwyu: Fix warnings in `src/util` and treat them as errors

2026-01-29 17:02:30 aborted 260129-iwyu-util 080f35a3814aa2f6ae6a5e33171f8df1d1441f7d

Tags

Windows-cross to x86_64, ${{ matrix.crt }}

260129-iwyu-util