silence another ue 5.5 deprecation warning with a temporary workaround for the time being

Source/SenseGloveTracking/Private/SGTracking/SGXRTracker.cpp

@@ -1163,9 +1163,28 @@ bool FSGXRTracker::GetMotionControllerData(
         {
             OutMotionControllerData.DeviceVisualType = EXRVisualType::Hand;
 
+            /// TODO
+            // This is a just a temporary workaround to silence a UE 5.5 deprecation warning.
+            // Should be refactored with a proper implementation when migrating away from the deprecated
+            // `FXRMotionControllerData` in favor of newly introduced
+            // `FXRMotionControllerState` and `FXRHandTrackingState` structs.
+#if ENGINE_MAJOR_VERSION >= 5 && ENGINE_MINOR_VERSION >= 5
+            bool bTracked = false;
+#endif  /* ENGINE_MAJOR_VERSION >= 5 && ENGINE_MINOR_VERSION >= 5 */
             OutMotionControllerData.bValid = HandTracker->GetAllKeypointStates(
                 Hand, OutMotionControllerData.HandKeyPositions, OutMotionControllerData.HandKeyRotations,
-                OutMotionControllerData.HandKeyRadii);
+                OutMotionControllerData.HandKeyRadii
+#if ENGINE_MAJOR_VERSION >= 5 && ENGINE_MINOR_VERSION >= 5
+                , bTracked
+#endif  /* ENGINE_MAJOR_VERSION >= 5 && ENGINE_MINOR_VERSION >= 5 */
+                );
+
+#if ENGINE_MAJOR_VERSION >= 5 && ENGINE_MINOR_VERSION >= 5
+            if (!bTracked)
+            {
+                return false;
+            }
+#endif  /* ENGINE_MAJOR_VERSION >= 5 && ENGINE_MINOR_VERSION >= 5 */
 
             if (!ensureAlwaysMsgf(
                 !OutMotionControllerData.bValid