audit small applets and mark some of them as NOFORK.
Put big scary warnings in relevant places.

diff --git a/editors/awk.c b/editors/awk.c
index f331a33..1bdb9b9 100644
--- a/editors/awk.c
+++ b/editors/awk.c
@@ -11,6 +11,8 @@
 #include "xregex.h"
 #include <math.h>
 
+/* This is a NOEXEC applet. Be very careful! */
+
 
 #define	MAXVARFMT       240
 #define	MINNVBLOCK      64