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>

util/ipa_pwd_ntlm.c

@@ -18,6 +18,10 @@
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * This file includes an "OpenSSL license exception", see the
+ * COPYING.openssl file for details.
+ *
  */
 
 #include <stdbool.h>