recreate mailbox to use a queue instead

src/citra/emu_window/emu_window_sdl2.cpp

@@ -225,7 +225,7 @@ void EmuWindow_SDL2::Present() {
     SDL_GL_MakeCurrent(render_window, window_context);
     SDL_GL_SetSwapInterval(1);
     while (IsOpen()) {
-        VideoCore::g_renderer->Present();
+        VideoCore::g_renderer->TryPresent(100);
         SDL_GL_SwapWindow(render_window);
         VideoCore::g_renderer->PresentComplete();
     }