[PATCH v2 0/2] 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.

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  v2: win32u: Use VK_EXT_headless_surface for nulldrv surface.
      winevulkan: Enable VK_EXT_headless_surface extension.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/7412