Fix unused variable warning

source/RobotAPI/components/ArViz/Coin/VisualizationRobot.cpp

@@ -90,6 +90,7 @@ namespace armarx::viz::coin
     bool VisualizationRobot::update(ElementType const& element)
     {
         IceUtil::Time time_start = IceUtil::Time::now();
+        (void) time_start;
 
         bool robotChanged = loaded.project != element.project || loaded.filename != element.filename;
         if (robotChanged)