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

*** 232,242 ****
          }
          commd_err.size = strlen(msg_buf);
          commd_err.md_message = (uint64_t)(uintptr_t)&msg_buf[0];
  
          (void) metaioctl(MD_MN_COMMD_ERR, &commd_err, &mne, "rpc.mdcommd");
!         (void) uadmin(A_DUMP, AD_BOOT, NULL);
  }
  
  static void
  flush_fcout()
  {
--- 232,242 ----
          }
          commd_err.size = strlen(msg_buf);
          commd_err.md_message = (uint64_t)(uintptr_t)&msg_buf[0];
  
          (void) metaioctl(MD_MN_COMMD_ERR, &commd_err, &mne, "rpc.mdcommd");
!         (void) uadmin(A_DUMP, AD_BOOT, (uintptr_t)NULL);
  }
  
  static void
  flush_fcout()
  {