Prefer homebrew clang as `clang-cl` on macOS #469

Job	Run time
MSRV	44s
Check	51s
Test Suite (ubuntu-24.04, stable, clang-cl)	2m 45s
Test Suite (ubuntu-24.04, stable, clang)	2m 29s
Test Suite (ubuntu-24.04, nightly, clang-cl)	3m 17s
Test Suite (ubuntu-24.04, nightly, clang)	2m 1s
Test Suite (macos-latest, stable, clang-cl)	3m 8s
Test Suite (macos-latest, stable, clang)	2m 32s
Test Suite (macos-latest, nightly, clang-cl)	3m 33s
Test Suite (macos-latest, nightly, clang)	2m 10s
Test Suite (windows-latest, stable, clang-cl)	8m 11s
Test Suite (windows-latest, stable, clang)	11m 9s
Test Suite (windows-latest, nightly, clang-cl)	6m 14s
Test Suite (windows-latest, nightly, clang)	9m 34s
Clippy	31s
Rustfmt	5s
spellcheck	22s
	59m 36s

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