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/CSecurityNone.h b/common/rfb/CSecurityNone.h
index a7db6e0..d07815f 100644
--- a/common/rfb/CSecurityNone.h
+++ b/common/rfb/CSecurityNone.h
@@ -29,7 +29,8 @@
 
   class CSecurityNone : public CSecurity {
   public:
-    virtual bool processMsg(CConnection* cc) { return true; }
+    CSecurityNone(CConnection* cc) : CSecurity(cc) {}
+    virtual bool processMsg() { return true; }
     virtual int getType() const {return secTypeNone;}
     virtual const char* description() const {return "No Encryption";}
   };