[PATCH v3 0/4] MR7412: win32u: Use VK_EXT_headless_surface for nulldrv surface.

[Rémi Bernon]

Allows running more tests with nulldrv, including some D3D tests with vulkan renderer.

--
  v3: win32u: Use VK_EXT_headless_surface for nulldrv surface.
      win32u: Pass a vulkan_instance pointer to vulkan_surface_create.
      winevulkan: Enable the VK_EXT_headless_surface extension.
      winevulkan: Generate function pointers for required funcs.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/7412