FreeBSD testing: try downgrading to clang 13 #85

Job	Run time
ubuntu-20.04 + kwin	3m 58s
Test with perl:5.8.9-threaded-stretch	2m 0s
ubuntu-22.04 + fvwm	1m 22s
Test with perl:5.10.1-buster	1m 5s
ubuntu-22.04 + twm	58s
Test with perl:5.12.5-stretch	1m 34s
Test with perl:5.14.4-stretch	1m 21s
Test with perl:5.16.3-buster	1m 40s
Test with perl:5.18.4-buster	1m 3s
Test with perl:5.22.4-stretch	1m 23s
Test with perl:5.36.0-bullseye	1m 51s
Test with perl:5.38.0-bookworm	1m 17s
	19m 32s

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