Revert "main: Add Vulkan device selection for Mesa drivers"
This reverts commit 69b121b0.
https://docs.mesa3d.org/envvars.html#envvar-DRI_PRIME clearly says: "It applies to OpenGL and Vulkan"
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This reverts commit 69b121b0.
https://docs.mesa3d.org/envvars.html#envvar-DRI_PRIME clearly says: "It applies to OpenGL and Vulkan"