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

*** 29,43 ****
--- 29,48 ----
  /*      Copyright (c) 1988 AT&T */
  /*        All Rights Reserved   */
  
  /* Copyright (c) 2013, OmniTI Computer Consulting, Inc. All rights reserved. */
  
+ /*
+  * Copyright 2014 PALO, Richard.
+  */
+ 
  #ifndef _UNISTD_H
  #define _UNISTD_H
  
  #include <sys/feature_tests.h>
  
+ #include <sys/null.h>
  #include <sys/types.h>
  #include <sys/unistd.h>
  
  #ifdef  __cplusplus
  extern "C" {
*** 176,193 ****
  
  #ifndef _POSIX_VDISABLE
  #define _POSIX_VDISABLE         0
  #endif
  
- #ifndef NULL
- #if defined(_LP64)
- #define NULL    0L
- #else
- #define NULL    0
- #endif
- #endif
- 
  #define STDIN_FILENO    0
  #define STDOUT_FILENO   1
  #define STDERR_FILENO   2
  
  /*
--- 181,190 ----