apps/rehash.c: Convert ISO-8859-1 to UTF-8

Believe it or not, the VMS C compiler is remarking on this
Reviewed-by: NPaul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/7194)

(cherry picked from commit 4602cc85aff35b7aa5e27dc57ead89f0867637f9)

apps/rehash.c

 /*
  * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
- * Copyright (c) 2013-2014 Timo Ters <timo.teras@gmail.com>
+ * Copyright (c) 2013-2014 Timo Teräs <timo.teras@gmail.com>
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy