Add missing c/ADM_ping example

/******************************************************************************

 * Copyright 2021-2022, Barcelona Supercomputing Center (BSC), Spain

 *

 * This software was partially supported by the EuroHPC-funded project ADMIRE

 *   (Project ID: 956748, https://www.admire-eurohpc.eu).

 *

 * This file is part of scord.

 *

 * scord is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * scord is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with scord.  If not, see <https://www.gnu.org/licenses/>.

 *

 * SPDX-License-Identifier: GPL-3.0-or-later

 *****************************************************************************/

#include <stdlib.h>

#include <stdio.h>

#include <admire.h>

#include <assert.h>

int

main(int argc, char* argv[]) {

    if(argc != 2) {

        fprintf(stderr, "ERROR: no location provided\n");

        fprintf(stderr, "Usage: ADM_ping <SERVER_ADDRESS>\n");

        exit(EXIT_FAILURE);

    }

    ADM_server_t server = ADM_server_create("tcp", argv[1]);

    ADM_return_t ret = ADM_ping(server);

    if(ret != ADM_SUCCESS) {

        fprintf(stdout, "ADM_ping() remote procedure not completed "

                        "successfully\n");

        exit(EXIT_FAILURE);

    }

    exit(EXIT_SUCCESS);

}

# SPDX-License-Identifier: GPL-3.0-or-later                                    #

################################################################################

list(APPEND examples_c ADM_register_job ADM_cancel_transfer ADM_connect_data_operation ADM_define_data_operation

list(APPEND examples_c ADM_ping ADM_register_job ADM_cancel_transfer ADM_connect_data_operation ADM_define_data_operation

  ADM_deploy_adhoc_storage ADM_finalize_data_operation ADM_get_pending_transfers ADM_get_qos_constraints

  ADM_get_statistics ADM_get_transfer_priority ADM_link_transfer_to_data_operation

  ADM_register_adhoc_storage ADM_remove_adhoc_storage ADM_remove_job ADM_set_dataset_information