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

@@ -245,11 +245,11 @@
         err.dteda_pdesc = errpd;
         err.dteda_cpu = data->dtpda_cpu;
         err.dteda_action = -1;
         err.dteda_offset = -1;
         err.dteda_fault = DTRACEFLT_LIBRARY;
-        err.dteda_addr = NULL;
+        err.dteda_addr = 0L;
 
         len = strlen(faultstr) +
             strlen(errpd->dtpd_provider) + strlen(errpd->dtpd_mod) +
             strlen(errpd->dtpd_name) + strlen(errpd->dtpd_func) +
             slop;