mongoc_ssl_opt_t(3) on Linux
The text 9be310757e47, as Debian 9 (Stretch) shipped it.
typedef struct { const char *pem_file; const char *pem_pwd; const char *ca_file; const char *ca_dir; const char *crl_file; bool weak_cert_validation; bool allow_invalid_hostname; void *padding [7]; } mongoc_ssl_opt_t;