[Merge] ~mwhudson/livecd-rootfs/+git/livecd-rootfs:rebuild-archive-1 into livecd-rootfs:ubuntu/master

[Michael Hudson-Doyle]

Michael Hudson-Doyle has proposed merging ~mwhudson/livecd-rootfs/+git/livecd-rootfs:rebuild-archive-1 into livecd-rootfs:ubuntu/master.

Commit message:
 livecd-rootfs (2.766) UNRELEASED; urgency=medium
 .
   * auto/config, auto/build, functions: Add some code to make building against
     a rebuild archive easier (such a build will still require a sourceful
     change, but that seems OK).


Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~mwhudson/livecd-rootfs/+git/livecd-rootfs/+merge/425053

live-build has a million different options and variables for mirrors to use at different points in the build process but this seems to work (image builds against the current rebuild archives fail in the end because they don't have published kernels, but it works up to that point at least).
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~mwhudson/livecd-rootfs/+git/livecd-rootfs:rebuild-archive-1 into livecd-rootfs:ubuntu/master.
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