Add ENet thirdparty

Source/ThirdParty/enet/enet.Build.cs

@@ -0,0 +1,32 @@
+// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
+
+using System.IO;
+using Flax.Build;
+using Flax.Build.NativeCpp;
+
+/// <summary>
+/// https://github.com/zpl-c/enet
+/// </summary>
+public class ENet : DepsModule
+{
+    /// <inheritdoc />
+    public override void Init()
+    {
+        base.Init();
+
+        LicenseType = LicenseTypes.Custom;
+        LicenseFilePath = "enet License.txt";
+
+        // Merge third-party modules into engine binary
+        BinaryModuleName = "FlaxEngine";
+    }
+
+    /// <inheritdoc />
+    public override void Setup(BuildOptions options)
+    {
+        base.Setup(options);
+
+        var depsRoot = options.DepsFolder;
+        options.PublicDefinitions.Add("ENET");
+    }
+}