System: Obey optimal frame pacing setting on Linux

This was previously being ignored.

src/core/system.cpp

@@ -2370,19 +2370,9 @@ void System::Throttle(Timer::Value current_time, Timer::Value sleep_until)
   // If we are running the GDB server and have clients, then use it to sleep instead.
   // That way in a query->response->query->response chain, we don't process only one message per frame.
   if (GDBServer::HasAnyClients())
-  {
     GDBServer::PollUntil(sleep_until);
-  }
   else
-  {
-    // Use a spinwait if we undersleep for all platforms except android.. don't want to burn battery.
-    // Linux also seems to do a much better job of waking up at the requested time.
-#ifndef __linux__
     Timer::SleepUntil(sleep_until, g_settings.display_optimal_frame_pacing);
-#else
-    Timer::SleepUntil(sleep_until, false);
-#endif
-  }
 
 #if 0
   const Timer::Value time_after_sleep = Timer::GetCurrentValue();

src/core/video_presenter.cpp

@@ -79,8 +79,6 @@ static bool LoadOverlaySettings();
 static bool LoadOverlayTexture();
 static bool LoadOverlayPreset(Error* error, Image* image);
 
-static void SleepUntilPresentTime(u64 present_time);
-
 namespace {
 
 struct Locals
@@ -1571,7 +1569,7 @@ bool VideoPresenter::PresentFrame(GPUBackend* backend, u64 present_time)
     {
       // No explicit present support, simulate it with Flush.
       g_gpu_device->FlushCommands();
-      SleepUntilPresentTime(present_time);
+      Timer::SleepUntil(present_time, true);
     }
 
     g_gpu_device->EndPresent(swap_chain, explicit_present, timed_present ? present_time : 0);
@@ -1581,7 +1579,7 @@ bool VideoPresenter::PresentFrame(GPUBackend* backend, u64 present_time)
 
     if (explicit_present)
     {
-      SleepUntilPresentTime(present_time);
+      Timer::SleepUntil(present_time, true);
       g_gpu_device->SubmitPresent(swap_chain);
     }
 
@@ -1614,18 +1612,6 @@ bool VideoPresenter::PresentFrame(GPUBackend* backend, u64 present_time)
   return true;
 }
 
-void VideoPresenter::SleepUntilPresentTime(u64 present_time)
-{
-  // Use a spinwait if we undersleep for all platforms except android.. don't want to burn battery.
-  // Linux also seems to do a much better job of waking up at the requested time.
-
-#if !defined(__linux__) && !defined(__ANDROID__)
-  Timer::SleepUntil(present_time, true);
-#else
-  Timer::SleepUntil(present_time, false);
-#endif
-}
-
 bool VideoPresenter::RenderScreenshotToBuffer(u32 width, u32 height, bool postfx, bool apply_aspect_ratio,
                                               Image* out_image, Error* error)
 {