Task 63535545459

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

2026-02-13 14:11:10 aborted 260129-iwyu-util 8cb1a631fa39a3abf7e33f233b06c45ce9d952a2

Tags

Windows, ${{ matrix.crt }}, test cross-built

260129-iwyu-util