Headless SDL: Add support for Vulkan rendering

SDL/SDLUtil.h

@@ -0,0 +1,9 @@
+#pragma once
+
+#include <SDL3/SDL.h>
+#include "Common/GPU/MiscTypes.h"
+#include <string>
+
+struct WindowDesc;
+
+bool DetermineVulkanWindowSystem(SDL_Window *window, WindowDesc *desc, std::string *errorMessage);