target/sdk: Switch to xz compression instead of bz2

Switch to xz compression instead of using bz2.
This makes a considerable difference in size, ar71xx SDK from 60M to 35M.

Signed-off-by: Daniel Engberg <daniel.engberg.lists@pyret.net>
This commit is contained in:
Daniel Engberg 2016-10-11 13:51:44 +02:00 committed by Felix Fietkau
parent 8f2c2f94cf
commit 9f61ccd9e3