pub unsafe extern "C" fn OPENSSL_sk_deep_copy(
sk: *const OPENSSL_STACK,
call_copy_func: OPENSSL_sk_call_copy_func,
copy_func: OPENSSL_sk_copy_func,
call_free_func: OPENSSL_sk_call_free_func,
free_func: OPENSSL_sk_free_func,
) -> *mut OPENSSL_STACK