Remove IL2CPP incompatibility workaround.

Assets/MsvcStdextWorkaround.cs

@@ -1,24 +0,0 @@
-#if UNITY_EDITOR
-using System;
-using UnityEditor.Build;
-using UnityEditor.Build.Reporting;
-
-public class MsvcStdextWorkaround : IPreprocessBuildWithReport {
-	const string kWorkaroundFlag = "/D_SILENCE_STDEXT_HASH_DEPRECATION_WARNINGS";
-
-	public int callbackOrder => 0;
-
-	public void OnPreprocessBuild(BuildReport report) {
-		var clEnv = Environment.GetEnvironmentVariable("_CL_");
-
-		if (string.IsNullOrEmpty(clEnv)) {
-			Environment.SetEnvironmentVariable("_CL_", kWorkaroundFlag);
-		}
-		else if (!clEnv.Contains(kWorkaroundFlag)) {
-			clEnv += " " + kWorkaroundFlag;
-			Environment.SetEnvironmentVariable("_CL_", clEnv);
-		}
-	}
-}
-
-#endif // UNITY_EDITOR

Assets/MsvcStdextWorkaround.cs.meta

@@ -1,11 +0,0 @@
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-guid: 9ed0687e714ce1042921c0057f42039f
-MonoImporter:
-  externalObjects: {}
-  serializedVersion: 2
-  defaultReferences: []
-  executionOrder: 0
-  icon: {instanceID: 0}
-  userData: 
-  assetBundleName: 
-  assetBundleVariant: