fix: add dummy LinuxLeaderboardManager implementation

Minecraft.Client/Platform/Linux/Leaderboards/LinuxLeaderboardManager.cpp

@@ -0,0 +1,5 @@
+#include "../../../../Minecraft.World/Platform/stdafx.h"
+
+#include "LinuxLeaderboardManager.h"
+
+LeaderboardManager *LeaderboardManager::m_instance = new LinuxLeaderboardManager(); //Singleton instance of the LeaderboardManager

Minecraft.Client/Platform/Linux/Leaderboards/LinuxLeaderboardManager.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "../../Common/Leaderboards/LeaderboardManager.h"
+
+class LinuxLeaderboardManager : public LeaderboardManager
+{
+public:
+	virtual void Tick() {}
+
+	//Open a session
+	virtual bool OpenSession() { return true; }
+
+	//Close a session
+	virtual void CloseSession() {}
+
+	//Delete a session
+	virtual void DeleteSession() {}
+
+	//Write the given stats
+	//This is called synchronously and will not free any memory allocated for views when it is done
+
+	virtual bool WriteStats(unsigned int viewCount, ViewIn views) { return false; }
+
+	virtual bool ReadStats_Friends(LeaderboardReadListener *callback, int difficulty, EStatsType type, PlayerUID myUID) { return false; }
+	virtual bool ReadStats_MyScore(LeaderboardReadListener *callback, int difficulty, EStatsType type, PlayerUID myUID, unsigned int readCount) { return false; }
+	virtual bool ReadStats_TopRank(LeaderboardReadListener *callback, int difficulty, EStatsType type, unsigned int startIndex, unsigned int readCount) { return false; }
+
+	//Perform a flush of the stats
+	virtual void FlushStats() {}
+
+	//Cancel the current operation
+	virtual void CancelOperation() {}
+
+	//Is the leaderboard manager idle.
+	virtual bool isIdle() { return true; }
+};