Update some internal files to use SDL_WindowFlags

test/testvulkan.c

@@ -612,7 +612,7 @@ static SDL_bool createSwapchain(void)
     int w, h;
     VkSwapchainCreateInfoKHR createInfo = { 0 };
     VkResult result;
-    Uint32 flags;
+    SDL_WindowFlags flags;
 
     // pick an image count
     vulkanContext->swapchainDesiredImageCount = vulkanContext->surfaceCapabilities.minImageCount + 1;