pub unsafe extern "C" fn ENGINE_get_ssl_client_cert_function(
e: *const engine_st,
) -> Option<unsafe extern "C" fn(_: *mut engine_st, _: *mut ssl_st, _: *mut stack_st_X509_NAME, _: *mut *mut x509_st, _: *mut *mut evp_pkey_st, _: *mut *mut stack_st_X509, _: *mut ui_method_st, _: *mut c_void) -> i32>