remove comment that hasn't been true for quite a while now;

ok deraadt@ djm@

src/lib/libc/crypt/arc4random.c

@@ -1,4 +1,4 @@
-/*	$OpenBSD: arc4random.c,v 1.21 2009/12/15 18:19:06 guenther Exp $	*/
+/*	$OpenBSD: arc4random.c,v 1.22 2010/12/22 08:23:42 otto Exp $	*/
 
 /*
  * Copyright (c) 1996, David Mazieres <dm@uun.org>
@@ -26,11 +26,6 @@
  * which is a trade secret).  The same algorithm is used as a stream
  * cipher called "arcfour" in Tatu Ylonen's ssh package.
  *
- * Here the stream cipher has been modified always to include the time
- * when initializing the state.  That makes it impossible to
- * regenerate the same random sequence twice, so this can't be used
- * for encryption, but will generate good random numbers.
- *
  * RC4 is a registered trademark of RSA Laboratories.
  */