test-archive: silence stupid messages from GNU tar
Recent versions of GNU tar have apparently decided they're old enough
that it's ok for them to prattle on senselessly about things no one
cares about without anyone objecting. We object; apply duct tape.
adding a
now at: a.patch
applying b.patch
applying c.patch
now at: c.patch
now at: b.patch
% Using index
now at: a.patch
applying b.patch
applying c.patch
now at: c.patch
% No warnings when using index
now at: b.patch
applying c.patch
applying bug314159
now at: bug314159
% Detect ambiguous non-index
patch name "14" is ambiguous:
bug314159
bug141421
abort: patch 14 not in series