Maemo: Use dynamic port list.

Check whether the ports we need are actually available on the device.
As a side effect, this makes it possible to debug more than one
application at the same time on Maemo.

Task-number: QTCREATORBUG-2702

src/plugins/debugger/qml/qmlengine.h

@@ -48,7 +48,7 @@ public:
     explicit QmlEngine(const DebuggerStartParameters &startParameters);
     virtual ~QmlEngine();
 
-    void handleRemoteSetupDone();
+    void handleRemoteSetupDone(int port);
     void handleRemoteSetupFailed(const QString &message);
 
     void setAttachToRunningExternalApp(bool value);