add license exception for linking with OpenSSL

Author: pjstevns

COPYING

@@ -255,6 +255,21 @@ make exceptions for this.  Our decision will be guided by the two goals
 of preserving the free status of all derivatives of our free software and
 of promoting the sharing and reuse of software generally.
 
+                             EXCEPTION
+
+In addition, as a special exception, the copyright holders give permission to
+link the code of portions of this program with the OpenSSL library under
+certain conditions as described in each individual source file, and distribute
+linked combinations including the two.
+
+You must obey the GNU General Public License in all respects for all of the
+code used other than OpenSSL.  If you modify file(s) with this exception, you
+may extend this exception to your version of the file(s), but you are not
+obligated to do so.  If you do not wish to do so, delete this exception
+statement from your version.  If you delete this exception statement from all
+source files in the program, then also delete it here.
+
+
 			    NO WARRANTY
 
   11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY