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

*** 123,133 ****
  }
  
  void
  sdbc_report_error(spcs_s_info_t *ustatus)
  {
!         if (*ustatus != NULL) {
                  spcs_s_report(*ustatus, stderr);
                  spcs_s_ufree(ustatus);
          } else
                  (void) fprintf(stderr, "%s\n", strerror(errno));
  }
--- 123,133 ----
  }
  
  void
  sdbc_report_error(spcs_s_info_t *ustatus)
  {
!         if (*ustatus != (uintptr_t)NULL) {
                  spcs_s_report(*ustatus, stderr);
                  spcs_s_ufree(ustatus);
          } else
                  (void) fprintf(stderr, "%s\n", strerror(errno));
  }