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

coreutils/wc.c

@@ -166,5 +166,5 @@ int wc_main(int argc, char **argv)
 		print_counts(total_lines, total_words, total_chars,
 					 max_length, "total");
 	}
-	exit(TRUE);
+	return(TRUE);
 }