actually implement CURLOPT_RESOLVE removals

    if(!hostp->data)

      continue;

    if(hostp->data[0] == '-') {

      /* TODO: mark an entry for removal */

      char *entry_id;

      size_t entry_len;

      if(2 != sscanf(hostp->data + 1, "%255[^:]:%d", hostname, &port)) {

        infof(data, "Couldn't parse CURLOPT_RESOLVE removal entry '%s'!\n",

              hostp->data);

        continue;

      }

    else if(3 == sscanf(hostp->data, "%255[^:]:%d:%255s", hostname, &port,

                        address)) {

      /* Create an entry id, based upon the hostname and port */

      entry_id = create_hostcache_id(hostname, port);

      /* If we can't create the entry id, fail */

      if(!entry_id) {

        return CURLE_OUT_OF_MEMORY;

      }

      entry_len = strlen(entry_id);

      if(data->share)

        Curl_share_lock(data, CURL_LOCK_DATA_DNS, CURL_LOCK_ACCESS_SINGLE);

      /* delete entry, ignore if it didn't exist */

      Curl_hash_delete(data->dns.hostcache, entry_id, entry_len+1);

      if(data->share)

        Curl_share_unlock(data, CURL_LOCK_DATA_DNS);

      /* free the allocated entry_id again */

      free(entry_id);

    }

    else {

      struct Curl_dns_entry *dns;

      Curl_addrinfo *addr;

      char *entry_id;

      size_t entry_len;

      if(3 != sscanf(hostp->data, "%255[^:]:%d:%255s", hostname, &port,

                     address)) {

        infof(data, "Couldn't parse CURLOPT_RESOLVE entry '%s'!\n",

              hostp->data);

        continue;

      }

      addr = Curl_str2addr(address, port);

      if(!addr) {

        infof(data, "Resolve %s found illegal!\n", hostp->data);

        infof(data, "Address in '%s' found illegal!\n", hostp->data);

        continue;

      }