Add a clear OpenSSL exception.

We are linking with OpenSSL in 2 files, so make it clear we intentionally
add a GPLv3 exception to allow that linking by third parties.

Signed-off-by: Simo Sorce <simo@redhat.com>
Reviewed-By: Nathaniel McCallum <npmccallum@redhat.com>

ipapython/ipap11helper/p11helper.c

@@ -1,6 +1,9 @@
 /*
  * Copyright (C) 2014  FreeIPA Contributors see COPYING for license
  *
+ * This file includes an "OpenSSL license exception", see the
+ * COPYING.openssl file for details.
+ *
  * This code is based on PKCS#11 code snippets from NLnetLabs:
  * http://www.nlnetlabs.nl/publications/hsm/examples/pkcs11/
  * Original license follows: