target/imagebuilder: Switch to xz compression instead of bz2
authorDaniel Engberg <diizzyy@users.noreply.github.com>
Tue, 11 Oct 2016 12:14:48 +0000 (14:14 +0200)
committerJohn Crispin <john@phrozen.org>
Sat, 15 Oct 2016 09:36:51 +0000 (11:36 +0200)
Switch to xz compression instead of using bz2.
Saves about 20% of total size (ar71xx)

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>

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