generator: Make 'xz' into an optional group.
authorRichard Jones <rjones@redhat.com>
Thu, 20 May 2010 09:39:44 +0000 (10:39 +0100)
committerRichard Jones <rjones@redhat.com>
Thu, 20 May 2010 09:42:21 +0000 (10:42 +0100)
On Ubuntu <= Karmic, xz-utils was not packaged, and therefore
any xz-related tests would fail.  Thus make this an optional
group so that we can test for this and avoid running the tests
if xz utils are not present.


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