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

*** 266,273 ****
  
  void
  pt_sugg_as_root(void)
  {
          pt_sugg_add("Suggestion: run as root to get suggestions"
!             " for reducing system power consumption",  40, NULL, NULL,
              NULL);
  }
--- 266,273 ----
  
  void
  pt_sugg_as_root(void)
  {
          pt_sugg_add("Suggestion: run as root to get suggestions"
!             " for reducing system power consumption",  40, '\0', NULL,
              NULL);
  }