Prevent leak of SecurityServer and ClientServer.

They are created in SConnection's and CConnection's constructors but never destroyed.

There is no reason for the indirection, so lets make them direct members.
diff --git a/common/rfb/SConnection.h b/common/rfb/SConnection.h
index b43cf08..63dc314 100644
--- a/common/rfb/SConnection.h
+++ b/common/rfb/SConnection.h
@@ -196,7 +196,7 @@
     rdr::OutStream* os;
     SMsgReader* reader_;
     SMsgWriter* writer_;
-    SecurityServer *security;
+    SecurityServer security;
     SSecurity* ssecurity;
     stateEnum state_;
     rdr::S32 preferredEncoding;