Leave generate13EncryptedExtensions without an unused state parameter, relates to github #1468.

Author: mondain

tls/src/main/java/org/bouncycastle/tls/DTLSServerProtocol.java

@@ -577,7 +577,7 @@ protected byte[] send13ServerHelloCoda(ServerHandshakeState state, DTLSReliableH
         recordLayer.enablePendingEpochRead();
 
         handshake.sendMessage(HandshakeType.encrypted_extensions,
-            generate13EncryptedExtensions(state, state.serverExtensions));
+            generate13EncryptedExtensions(state.serverExtensions));
 
         if (state.selectedPSK13)
         {
@@ -1037,7 +1037,7 @@ protected void processClientHelloRetry(ServerHandshakeState state, byte[] body)
     /**
      * Mirrors TlsServerProtocol.send13EncryptedExtensionsMessage.
      */
-    protected byte[] generate13EncryptedExtensions(ServerHandshakeState state, Hashtable serverExtensions)
+    protected byte[] generate13EncryptedExtensions(Hashtable serverExtensions)
         throws IOException
     {
         byte[] extBytes = TlsProtocol.writeExtensionsData(serverExtensions);