Task 67776706529

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

2026-03-19 16:16:05 aborted 260129-iwyu-util f9efc6243d93c5f6c843821c311ba77c1877d00c

Tags

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

260129-iwyu-util