HostDisplay: Add threaded presentation for Vulkan renderer

Can add a significant speedup for fast forward. Automatically disabled
when vsync is enabled.

src/duckstation-libretro/libretro_vulkan_host_display.h

@@ -14,7 +14,8 @@ public:
 
   static bool RequestHardwareRendererContext(retro_hw_render_callback* cb);
 
-  bool CreateRenderDevice(const WindowInfo& wi, std::string_view adapter_name, bool debug_device) override;
+  bool CreateRenderDevice(const WindowInfo& wi, std::string_view adapter_name, bool debug_device,
+                          bool threaded_presentation) override;
   void DestroyRenderDevice() override;
 
   void ResizeRenderWindow(s32 new_window_width, s32 new_window_height) override;