C unwind is stable #1643

Job	Run time
msrv	1m 40s
check-cfg	30s
minimal	18s
docs	47s
quickchecking	35s
rustfmt-clippy	50s
test-book	17s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	3m 58s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	2m 45s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	3m 25s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	3m 33s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	3m 25s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	4m 52s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	3m 41s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	3m 22s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	3m 8s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	3m 48s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	3m 26s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	3m 16s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	4m 48s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	5m 12s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	3m 54s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	4m 47s
test (ubuntu-latest, 9.0, 0, 0, 1)	2m 19s
test (macos-latest, 9.0, 0, 0, 0)	2m 17s
test-expectations (ubuntu-latest)	2m 24s
test-expectations (macos-latest)	4m 4s
	1h 17m 21s

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