Fix IL2CPP incompatibility.

Assets/MsvcStdextWorkaround.cs

@@ -0,0 +1,24 @@
+#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

@@ -0,0 +1,11 @@
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+MonoImporter:
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+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
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