fix: sln & m_instance

Minecraft.Client/Common/Leaderboards/LeaderboardManager.cpp

@@ -9,6 +9,10 @@ const wstring LeaderboardManager::filterNames[eNumFilterModes] =
 		L"Friends", L"MyScore", L"TopRank"
 	};
 
+#if !defined(_DURANGO) && !defined(_WINDOWS64) && !defined(_XBOX) && !defined(__ORBIS__) && !defined(__PSVITA__) // str1k3r - some platforms complain about this, also this wasnt in the leak?
+LeaderboardManager *LeaderboardManager::m_instance = NULL;
+#endif
+
 void LeaderboardManager::DeleteInstance()
 {
 	delete m_instance;