fix C++ static wrappers generation #3030

Job	Run time
check-cfg	24s
minimal	10s
docs	33s
msrv	51s
quickchecking	15s
rustfmt-clippy	32s
test-book	13s
test (ubuntu-latest, 9.0, 0, 0, 0, 0)	1m 29s
test-expectations (ubuntu-latest)	39s
test (ubuntu-latest, 9.0, 0, 0, 1, 0)	1m 33s
test-no-headers	36s
test-expectations (macos-latest)	1m 1s
test (ubuntu-latest, 9.0, 0, 1, 0, 0)	1m 26s
test (ubuntu-latest, 9.0, 0, 1, 1, 0)	1m 25s
test (ubuntu-latest, 9.0, 1, 0, 0, 0)	1m 39s
test (ubuntu-latest, 9.0, 1, 0, 1, 0)	1m 40s
test (ubuntu-latest, 9.0, 1, 1, 0, 0)	1m 39s
test (ubuntu-latest, 9.0, 1, 1, 1, 0)	1m 40s
test (ubuntu-latest, 16.0, 0, 0, 0, 0)	1m 40s
test (ubuntu-latest, 16.0, 0, 0, 1, 0)	1m 42s
test (ubuntu-latest, 16.0, 0, 1, 0, 0)	1m 42s
test (ubuntu-latest, 16.0, 0, 1, 1, 0)	1m 41s
test (ubuntu-latest, 16.0, 1, 0, 0, 0)	1m 42s
test (ubuntu-latest, 16.0, 1, 0, 1, 0)	1m 42s
test (ubuntu-latest, 16.0, 1, 1, 0, 0)	1m 41s
test (ubuntu-latest, 16.0, 1, 1, 1, 0)	1m 40s
test (ubuntu-latest, 16.0, 0, 0, 1)	1m 42s
test (macos-latest, 16.0, 0, 0, 0)	1m 39s
success	1s
	34m 37s

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