xenctrl.0.9.26: add dependency on debian/ubuntu uuid-dev

Ideally uuid-dev should be a dependency of libxen-dev, but adding it
here should work around the packaging bug.

Signed-off-by: David Scott <dave.scott@citrix.com>
Merge pull request #2703 from djs55/depexts-xenctrl

xenctrl.0.9.26: add dependency on debian/ubuntu uuid-dev