fix missing c# import

Assets/Scenes/MyFactory.unity

@@ -22863,6 +22863,7 @@ GameObject:
   m_Component:
   - component: {fileID: 1559810201}
   - component: {fileID: 1559810200}
+  - component: {fileID: 1559810202}
   m_Layer: 0
   m_Name: BaseGameHandles
   m_TagString: Untagged
@@ -22897,6 +22898,18 @@ Transform:
   m_Children: []
   m_Father: {fileID: 0}
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
+--- !u!114 &1559810202
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 1559810199}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 5384884ed8e0b864cb4f90b078206b62, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: Assembly-CSharp::ExitHandles
 --- !u!1001 &1562126400
 PrefabInstance:
   m_ObjectHideFlags: 0

Assets/Scripts/StartupHeadsetCheck.cs

@@ -1,5 +1,6 @@
 using System.Collections;
 using System.Collections.Generic;
+using System.Runtime.InteropServices;
 using UnityEngine;
 using UnityEngine.XR;
 using UnityEngine.XR.Management;