Fix "Not a Member" build errors

This better work or else I will have to work out how to build again on Mac 😅

src/core/hle/service/acc/acc.h

@@ -47,6 +47,9 @@ public:
         void StoreSaveDataThumbnailApplication(HLERequestContext& ctx);
         void GetBaasAccountManagerForSystemService(HLERequestContext& ctx);
         void StoreSaveDataThumbnailSystem(HLERequestContext& ctx);
+        void ClearSaveDataThumbnail(HLERequestContext& ctx);
+        void LoadSaveDataThumbnail(HLERequestContext& ctx);
+        void GetSaveDataThumbnailExistence(HLERequestContext& ctx);
 
     private:
         Result InitializeApplicationInfoBase();