Initial Common Channels for ircu

void relay_private_notice(struct Client* sptr, const char* name, const char* text)
{
  struct Client* acptr;
  struct Membership* chansrc;
  struct Membership* chandst;
  const struct User* usersrc = cli_user(sptr);
  const struct User* userdst = cli_user(acptr);
  int chanfound=0;

  ...

  /* ScaryNet
   * +C check, if target is in a common channel with the destination
   * allow, otherwise reject
   */
  if (IsInchanOnly(acptr) && !IsOper(sptr) && !IsChannelService(sptr)) {
    for (chansrc = usersrc->channel; chansrc; chansrc = chansrc->next_channel) {
      for (chandst = userdst->channel; chandst; chandst = chandst->next_channel) {
        if (chandst->channel == chansrc->channel) {
          chanfound = 1;
          break;
        }
      }
      if (chanfound == 1)
        break;
    }
    MyFree(chansrc);
    MyFree(chandst);
    if (chanfound == 0) {
      return;
    }
  }

  /*
   * deliver the message
   */
  if (MyUser(acptr))
    add_target(acptr, sptr);

  sendcmdto_one(sptr, CMD_NOTICE, acptr, "%C :%s", acptr, text);
}