Exclude Discord Game SDK from Android builds.

Assets/Cryville/Crtr/DiscordController.cs

@@ -1,11 +1,17 @@
+#if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
+#define COMPILE
+#endif
+
+#if COMPILE
 using Discord;
 using System;
-using UnityEngine;
 using Logger = Cryville.Common.Logging.Logger;
+#endif
+using UnityEngine;
 
 namespace Cryville.Crtr {
 	internal class DiscordController : MonoBehaviour {
-#if UNITY_STANDALONE_WIN || UNITY_EDITOR_WIN
+#if COMPILE
 		public static DiscordController Instance;
 
 		const long CLIENT_ID = 1059021675578007622L;