Update iso-image.nix to work with kernels that use AUFS 2.1 instead of AUFS 2. Older kernels are unaffected.
Update iso-image.nix to work with kernels that use AUFS 2.1 instead of AUFS 2. Older kernels are unaffected.


git-svn-id: 71c8032c709790ec749031c4215f8515ac00dc5a@26646 70bd8c7a-acb8-0310-9f0d-9cc1c95dcdbb

falsifian/personal_nixos,falsifian/personal_nixos,falsifian/personal_nixos,falsifian/personal_nixos,falsifian/personal_nixos