In some cases we are using an initramfs image that pre-mounts some of the directories, so let's skip them in the next stage. Reviewed-by: Eric Engestrom <eric@igalia.com> Reviewed-by: David Heidelberg <david.heidelberg@collabora.com> Signed-off-by: Juan A. Suarez Romero <jasuarez@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/26552>