fix C++ static wrappers generation #3027

Job	Run time
minimal	12s
docs	21s
check-cfg	21s
quickchecking	31s
rustfmt-clippy	26s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 29s
msrv	53s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 22s
test-expectations (ubuntu-latest)	44s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 25s
test-expectations (macos-latest)	59s
test-book	15s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 29s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	1m 38s
test-no-headers	42s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	1m 38s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	1m 38s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	1m 38s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	1m 37s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	1m 38s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	1m 39s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	1m 40s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	1m 38s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	1m 25s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	1m 38s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	1m 37s
test (ubuntu-latest, 16.0, 0, 0, 1)	1m 39s
test (macos-latest, 16.0, 0, 0, 0)	1m 56s
success	1s
	34m 9s

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