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)