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/mknod.c

@@ -98,6 +98,6 @@ int mknod_main(int argc, char **argv)
 
 	if (mknod(argv[0], mode, dev) != 0)
 		fatalError("%s: %s\n", argv[0], strerror(errno));
-	exit (TRUE);
+	return (TRUE);
 }