5218 posix definition of NULL
correct unistd.h and iso/stddef_iso.h
update gate source affected

*** 896,906 ****
                          *ptr++ = *r++;
                  }
          } else if (req->file_list)
                  strlcpy(buf, *req->file_list, sizeof (buf));
          
!         if (*buf == NULL || !strncmp(buf, SPOOLDIR, sizeof(SPOOLDIR)-1))
                  strcpy(buf, "<File name not available>");
  
          if (strlen(buf) > (size_t) 24) {
                  char *r;
  
--- 896,906 ----
                          *ptr++ = *r++;
                  }
          } else if (req->file_list)
                  strlcpy(buf, *req->file_list, sizeof (buf));
          
!         if (*buf == '\0' || !strncmp(buf, SPOOLDIR, sizeof(SPOOLDIR)-1))
                  strcpy(buf, "<File name not available>");
  
          if (strlen(buf) > (size_t) 24) {
                  char *r;