Fix build with libssl10

--- ./src/connection.cc

+++ ./src/connection.cc

@@ -307,7 +307,7 @@ SSL_Connection::SSL_Connection(Session *s) : gets_len(0)

     SSLeay_add_ssl_algorithms(); 

     /* construct the context for secure connections */

-    method = SSLv23_client_method();

+    method = (SSL_METHOD*) SSLv23_client_method();

     context = SSL_CTX_new(method);

     if (!context)