Remove SSL2 key material support.

--- packages/ssl/ssl4pl.c.orig	2014-09-22 22:06:43.891493659 +0200
+++ packages/ssl/ssl4pl.c	2014-09-22 22:07:17.743494074 +0200
@@ -67,7 +67,6 @@
 static functor_t FUNCTOR_crl1;
 static functor_t FUNCTOR_revocations1;
 static functor_t FUNCTOR_revoked2;
-static functor_t FUNCTOR_session_key1;
 static functor_t FUNCTOR_master_key1;
 static functor_t FUNCTOR_session_id1;
 static functor_t FUNCTOR_client_random1;
@@ -1537,13 +1536,6 @@
 		        PL_INTEGER, (int)session->ssl_version))
      return FALSE;
 
-  if ( !PL_unify_list_ex(list_t, node_t, list_t) )
-    return FALSE;
-  if ( !PL_unify_term(node_t,
-		      PL_FUNCTOR, FUNCTOR_session_key1,
-		        PL_NCHARS, session->key_arg_length, session->key_arg))
-    return FALSE;
-
   if ( !PL_unify_list_ex(list_t, node_t, list_t))
     return FALSE;
   if ( !PL_unify_term(node_t,
@@ -1624,7 +1616,6 @@
   FUNCTOR_crl1            = PL_new_functor(PL_new_atom("crl"), 1);
   FUNCTOR_revoked2        = PL_new_functor(PL_new_atom("revoked"), 2);
   FUNCTOR_revocations1    = PL_new_functor(PL_new_atom("revocations"), 1);
-  FUNCTOR_session_key1    = PL_new_functor(PL_new_atom("session_key"), 1);
   FUNCTOR_master_key1     = PL_new_functor(PL_new_atom("master_key"), 1);
   FUNCTOR_session_id1     = PL_new_functor(PL_new_atom("session_id"), 1);
   FUNCTOR_client_random1  = PL_new_functor(PL_new_atom("client_random"), 1);
