Update idletimer.cpp

Make it work without global variable initialization. This is due to golang/go#10023 (duplicate of golang/go#4069) and solves go-qml#142.

Author: neclepsio

cpp/idletimer.cpp

@@ -12,8 +12,10 @@ class IdleTimer : public QObject
     public:
 
     static IdleTimer *singleton() {
-        static IdleTimer singleton;
-        return &singleton;
+        //static IdleTimer singleton;
+        if (_singleton == nullptr) 
+			_singleton = new IdleTimer;
+		return _singleton;
     }
 
     void init(int32_t *guiIdleRun)
@@ -38,13 +40,17 @@ class IdleTimer : public QObject
         }
     }
 
+	static IdleTimer* _singleton;
+
     private:
 
     int32_t *guiIdleRun;
 
     QBasicTimer timer;    
 };
 
+IdleTimer* IdleTimer::_singleton;
+
 void idleTimerInit(int32_t *guiIdleRun)
 {
     IdleTimer::singleton()->init(guiIdleRun);