This makes sure nspawn's --volatile=yes switch works again: there we have a read-only image that is overmounted by a tmpfs (with the exception of /usr). This we need to mkdir all mount points even though the image is read-only. Hence, let's drop the optimizatio of avoiding mkdir() on images that are read-only, it's wrong and misleading here, since the image itself might be read-only but our mounts are not.
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