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`libvdrm` is unconditionally linked to `libvulkan_freedreno` which isn't available without the `virtio` subdirectory being included. It has been gated behind the `virtio` KMD to prevent linking errors in other cases as it's not necessary. Signed-off-by: Mark Collins <mark@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26100>