Fixed XRSettings shim on 2018.1

Chman · Chman · commit 22589c5d7bde · 2017-12-19T17:05:56.000+01:00
diff --git a/PostProcessing/Runtime/Utils/XRSettings.cs b/PostProcessing/Runtime/Utils/XRSettings.cs
@@ -1,5 +1,5 @@
 // Small shim for VRSettings/XRSettings on XboxOne and Switch
-#if UNITY_XBOXONE || UNITY_SWITCH
+#if !UNITY_2018_1_OR_NEWER && (UNITY_XBOXONE || UNITY_SWITCH)
 using System;
 
 namespace UnityEngine.XR
