Add OpenSSL licese exception. Fixes #8999

COPYING

@@ -1,3 +1,12 @@
+Additional permission under GNU GPL version 3 section 7
+
+If you modify this Program, or any covered work, by linking or combining
+it with the OpenSSL library (or a modified version of that library), 
+containing parts covered by the terms of the OpenSSL License, the 
+licensors of this Program grant you additional permission to convey 
+the resulting work.
+
+
                     GNU GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007