* Fix `nixos-rebuild build-vm-with-bootloader': QEMU now requires the   `readonly' flag if the disk image is not writable.
* Fix `nixos-rebuild build-vm-with-bootloader': QEMU now requires the
  `readonly' flag if the disk image is not writable.


git-svn-id: 71c8032c709790ec749031c4215f8515ac00dc5a@26245 70bd8c7a-acb8-0310-9f0d-9cc1c95dcdbb

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