Strongly bind security objects to connection object

There is already an implicit connection between them, so let's make
it explicit. This allows easy lookup outside of the processMsg() function.
diff --git a/common/rfb/CSecurityVeNCrypt.h b/common/rfb/CSecurityVeNCrypt.h
index 6d978c7..d015e8f 100644
--- a/common/rfb/CSecurityVeNCrypt.h
+++ b/common/rfb/CSecurityVeNCrypt.h
@@ -34,9 +34,9 @@
   class CSecurityVeNCrypt : public CSecurity {
   public:
 
-    CSecurityVeNCrypt(SecurityClient* sec);
+    CSecurityVeNCrypt(CConnection* cc, SecurityClient* sec);
     ~CSecurityVeNCrypt();
-    virtual bool processMsg(CConnection* cc);// { return true; }
+    virtual bool processMsg();
     int getType() const {return chosenType;}
     virtual const char* description() const;
     virtual bool isSecure() const;