Cleanup some copyright stuff

Remove some incorrect copyright references.
Move copyright to standard place
Add OpenSSL copyright where missing.
Remove copyrighted file that we don't use any more
Remove Itanium assembler for RC4 and MD5 (assembler versions of old and
weak algorithms for an old chip)
Standardize apps/rehash copyright comment; approved by Timo
Put dual-copyright notice on mkcert

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3691)
diff --git a/apps/vms_term_sock.c b/apps/vms_term_sock.c
index a7d87ff..ff954ed 100644
--- a/apps/vms_term_sock.c
+++ b/apps/vms_term_sock.c
@@ -1,4 +1,5 @@
 /*
+ * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
  * Copyright 2016 VMS Software, Inc. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use