Updates to a number of apps to remove warnings/compile errors under libc5.

Tested under both libc5 and libc6 and all seems well with these fixes.
 -Erik

miscutils/dutmp.c

@@ -56,5 +56,5 @@ extern int dutmp_main(int argc, char **argv)
 				(long)ut.ut_addr);
 	}
 
-	exit(TRUE);
+	return(TRUE);
 }