Use the right tar flag for xz.
Use the right tar flag for xz.

rchekaluk/cloudbiolinux,chapmanb/cloudbiolinux,rchekaluk/cloudbiolinux,rchekaluk/cloudbiolinux,chapmanb/cloudbiolinux,chapmanb/cloudbiolinux,chapmanb/cloudbiolinux,rchekaluk/cloudbiolinux