Function krb5_sys::krb5_c_crypto_length_iov

pub unsafe extern fn krb5_c_crypto_length_iov(context: krb5_context,
                                              enctype: krb5_enctype,
                                              data: *mut krb5_crypto_iov,
                                              num_data: usize)
                                              -> krb5_error_code