pub unsafe extern "C" fn grpc_ssl_credentials_create_ex(
    pem_root_certs: *const c_char,
    pem_key_cert_pair: *mut grpc_ssl_pem_key_cert_pair,
    verify_options: *const grpc_ssl_verify_peer_options,
    reserved: *mut c_void
) -> *mut grpc_channel_credentials