C unwind is stable (#2591) #1647

Job	Run time
docs	26s
msrv	1m 31s
minimal	17s
rustfmt-clippy	40s
check-cfg	30s
quickchecking	24s
test-book	9s
test (ubuntu-latest, 5.0, 1, 0, 0, 0, 0)	2m 53s
test (ubuntu-latest, 5.0, 1, 0, 0, 1, 0)	2m 40s
test (ubuntu-latest, 5.0, 1, 0, 1, 0, 0)	3m 5s
test (ubuntu-latest, 5.0, 1, 0, 1, 1, 0)	3m 39s
test (ubuntu-latest, 5.0, 1, 1, 0, 0, 0)	3m 54s
test (ubuntu-latest, 5.0, 1, 1, 0, 1, 0)	4m 20s
test (ubuntu-latest, 5.0, 1, 1, 1, 0, 0)	3m 35s
test (ubuntu-latest, 5.0, 1, 1, 1, 1, 0)	3m 17s
test (ubuntu-latest, 9.0, 1, 0, 0, 0, 0)	3m 4s
test (ubuntu-latest, 9.0, 1, 0, 0, 1, 0)	3m 6s
test (ubuntu-latest, 9.0, 1, 0, 1, 0, 0)	3m 35s
test (ubuntu-latest, 9.0, 1, 0, 1, 1, 0)	2m 47s
test (ubuntu-latest, 9.0, 1, 1, 0, 0, 0)	3m 56s
test (ubuntu-latest, 9.0, 1, 1, 0, 1, 0)	3m 53s
test (ubuntu-latest, 9.0, 1, 1, 1, 0, 0)	4m 58s
test (ubuntu-latest, 9.0, 1, 1, 1, 1, 0)	3m 55s
test (ubuntu-latest, 9.0, 0, 0, 1)	1m 58s
test (macos-latest, 9.0, 0, 0, 0)	2m 7s
test-expectations (ubuntu-latest)	1m 34s
test-expectations (macos-latest)	3m 45s
	1h 9m 58s

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