Remove dependency - pxz

Joseph Nuthalapatirequested to merge
njoseph/freedom-maker:remove-pxz-dependency into master

pxz will be removed from Debian buster. freedom-maker already uses xz instead of pxz. This commit removes both the code and dependency entry corresponding to pxz.

Fixes #153 (closed)

Signed-off-by: Joseph Nuthalapati njoseph@thoughtworks.com

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