libfetch: merge some features from FreeBSD:

- Supports HTTP/1.1 308 redirect.
- SSLv[23] HTTPS connections are forbidden by default.
- TLS client certificate validation thru OpenSSL.
- Fixes for user/password encoding, misc.

lib/fetch/ftp.c

@@ -1,6 +1,6 @@
 /*	$NetBSD: ftp.c,v 1.46 2014/06/11 13:12:12 joerg Exp $	*/
 /*-
- * Copyright (c) 1998-2004 Dag-Erling Co<EFBFBD>dan Sm<EFBFBD>rgrav
+ * Copyright (c) 1998-2004 Dag-Erling Smorgrav
  * Copyright (c) 2008, 2009, 2010 Joerg Sonnenberger <joerg@NetBSD.org>
  * All rights reserved.
  *
@@ -42,7 +42,7 @@
  *
  * Major Changelog:
  *
- * Dag-Erling Co<EFBFBD><EFBFBD>an Smgrav
+ * Dag-Erling Smograv
  * 9 Jun 1998
  *
  * Incorporated into libfetch