refs #910, check SimConnect DLL in listener

(preliminary version before we know P3D string variety)

src/plugins/simulator/fsxcommon/simulatorfsxcommon.h

@@ -305,6 +305,9 @@ namespace BlackSimPlugin
             //! Check simulator version and type
             bool checkVersionAndSimulator() const;
 
+            //! Check the simconnect.dll
+            bool checkSimConnectDll() const;
+
         private:
             QTimer *m_timer { nullptr };
             QString m_simulatorVersion;