Alexey Neyman 439cab379e Require xz to be present
Some software starts to adopt xz-only distribution (strace,
gcc-linaro, ...). Better that than deal with cryptic errors like
"cannot find strace-.tar.bz2".

Signed-off-by: Alexey Neyman <stilor@att.net>
2017-02-27 22:55:57 -08:00
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