make: unifdef for _CHECK_UPDATE_H (undefined)

*** 1320,1332 ****
   *              waitflg         dwight
   */
  void
  await_parallel(Boolean waitflg)
  {
- #ifdef _CHECK_UPDATE_H
-         static int number_of_unknown_children = 0;
- #endif /* _CHECK_UPDATE_H */
          Boolean         nohang;
          pid_t           pid;
          int             status;
          Running         rp;
          int             waiterr;
--- 1320,1329 ----
*** 1358,1374 ****
                       (rp != NULL) && (rp->pid != pid);
                       rp = rp->next) {
                          ;
                  }
                  if (rp == NULL) {
- #ifdef _CHECK_UPDATE_H
-                         /* Ignore first child - it is check_update */
-                         if (number_of_unknown_children <= 0) {
-                                 number_of_unknown_children = 1;
-                                 return;
-                         }
- #endif /* _CHECK_UPDATE_H */
                          if (send_mtool_msgs) {
                                  continue;
                          } else {
                                  fatal(catgets(catd, 1, 128, "Internal error: returned child pid not in running_list"));
                          }
--- 1355,1364 ----