Achievements: Re-add NeedsIdleUpdate()

Forgot I needed this on Android..

src/core/achievements.cpp

@@ -832,6 +832,15 @@ void Achievements::IdleUpdate()
   rc_client_idle(s_state.client);
 }
 
+bool Achievements::NeedsIdleUpdate()
+{
+  if (!IsActive())
+    return false;
+
+  const auto lock = GetLock();
+  return (s_state.http_downloader && s_state.http_downloader->HasAnyRequests());
+}
+
 void Achievements::FrameUpdate()
 {
   if (!IsActive())

src/core/achievements.h

@@ -58,6 +58,9 @@ 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);