客户端rsa，冗余清理，bug修复，安卓build问题

Assets/steamCheck.cs

@@ -1,6 +1,6 @@
 using UnityEngine;
 using UnityEngine.UI;
-#if !DISABLESTEAMWORKS
+#if UNITY_STANDALONE_WIN || UNITY_STANDALONE_LINUX || UNITY_STANDALONE_OSX || STEAMWORKS_WIN || STEAMWORKS_LIN_OSX
 using Steamworks;
 #endif
 
@@ -23,7 +23,7 @@ public class steamCheck : MonoBehaviour
 
     void RefreshSteamState()
     {
-#if DISABLESTEAMWORKS
+#if !(UNITY_STANDALONE_WIN || UNITY_STANDALONE_LINUX || UNITY_STANDALONE_OSX || STEAMWORKS_WIN || STEAMWORKS_LIN_OSX)
         steamReady = false;
         SetFailText("Current platform has Steamworks disabled");
         return;
@@ -51,7 +51,7 @@ public class steamCheck : MonoBehaviour
 
     void SetWelcomeText()
     {
-#if DISABLESTEAMWORKS
+#if !(UNITY_STANDALONE_WIN || UNITY_STANDALONE_LINUX || UNITY_STANDALONE_OSX || STEAMWORKS_WIN || STEAMWORKS_LIN_OSX)
         SetFailText("Current platform has Steamworks disabled");
 #else
         if (!SteamManager.SteamVerificationEnabled)