I rebased 'wip-binaries' on top of current master (which includes the
recent 'staging' merge), and excluding the update of mescc-tools to the
git checkout.

I built the bootstrap-tarballs for i686-linux and got the same hashes
that we've previously agreed on here.  I used "guix download" to load
the new bootstrap binaries into my store, and am now testing the
attached draft patch to 'core-updates'.

      Thanks,
        Mark