Misc: Build fixes for Android

src/core/achievements.h

@@ -11,6 +11,8 @@
 #include <utility>
 #include <vector>
 
+struct rc_client_t;
+
 class Error;
 class StateWrapper;
 class CDImage;
@@ -28,6 +30,9 @@ enum class LoginRequestReason
 /// Acquires the achievements lock. Must be held when accessing any achievement state from another thread.
 std::unique_lock<std::recursive_mutex> GetLock();
 
+/// Returns the rc_client instance. Should have the lock held.
+rc_client_t* GetClient();
+
 /// Initializes the RetroAchievments client.
 bool Initialize();
 
@@ -52,6 +57,9 @@ void FrameUpdate();
 /// Called when the system is paused, because FrameUpdate() won't be getting called.
 void IdleUpdate();
 
+/// Returns true if idle updates are necessary (e.g. outstanding requests).
+bool NeedsIdleUpdate();
+
 /// Saves/loads state.
 bool DoState(StateWrapper& sw);
 
@@ -118,6 +126,8 @@ void DrawGameOverlays();
 /// Draws ImGui overlays when paused.
 void DrawPauseMenuOverlays();
 
+#ifndef __ANDROID__
+
 /// Queries the achievement list, and if no achievements are available, returns false.
 bool PrepareAchievementsWindow();
 
@@ -130,6 +140,8 @@ bool PrepareLeaderboardsWindow();
 /// Renders the leaderboard list.
 void DrawLeaderboardsWindow();
 
+#endif // __ANDROID__
+
 #ifdef ENABLE_RAINTEGRATION
 /// Prevents the internal implementation from being used. Instead, RAIntegration will be
 /// called into when achievement-related events occur.