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Debian (in its infinite "wisdom") has decided to erase most evidence of
there ever being a ppc64el installer for Debian Jessie.

So, screw them. Backwards compatibility testing was for losers anyway.

There is snapshot.debian.org, but it's *really* slow pulling things from
there, so it's not really an option unless we want to add multiple
minutes to test duration.
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>