Zink OpenGL-On-Vulkan Now Correctly Rendering... Glxgears

With yesterday's Vulkan 1.2.177 bringing VK_EXT_provoking_vertex that provoking vertex extension ended up being what's needed to get glxgears to correctly render with the Zink OpenGL-on-Vulkan translation layer.
Yesterday evening on the same-day as the provoking vertex extension being published, Zink added support for this extension to allow the provoking vertex extension to match the last vertex behavior of OpenGL.
That's that and glxgears is now correctly rendering with this graphics API translation layer. Lead Zink developer Mike Blumenkrantz of Valve shared in a simple post entitled Farewell Old Friend:
Landing also in Mesa 21.2-devel is Lavapipe support and RADV support for VK_EXT_provoking_vertex.
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