FullscreenUI: Fix compiling without cheevos

src/frontend-common/fullscreen_ui.cpp

@@ -299,6 +299,8 @@ void CloseQuickMenu()
   ClearImGuiFocus();
 }
 
+#ifdef WITH_CHEEVOS
+
 bool OpenAchievementsWindow()
 {
   const bool achievements_enabled = Cheevos::HasActiveGame() && (Cheevos::GetAchievementCount() > 0);
@@ -322,6 +324,8 @@ bool OpenLeaderboardsWindow()
   return true;
 }
 
+#endif
+
 void Shutdown()
 {
   if (s_game_list_load_thread.joinable())

src/frontend-common/fullscreen_ui.h

@@ -49,8 +49,12 @@ void SystemDestroyed();
 void SystemPaused(bool paused);
 void OpenQuickMenu();
 void CloseQuickMenu();
+
+#ifdef WITH_CHEEVOS
 bool OpenAchievementsWindow();
 bool OpenLeaderboardsWindow();
+#endif
+
 void Shutdown();
 void Render();