[tlbuild] auxiliary binaries for pretest

[Norbert Preining]

On Thu, 25 Feb 2021, Karl Berry wrote:
> (Norbert, for various x86-linux I guess you built xz and lz4 on jessie
> last ... ?)

Update both of them, again on jessie.

Norbert

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PREINING Norbert                              https://www.preining.info
Fujitsu Research Labs  +  IFMGA Guide + TU Wien + TeX Live + Debian Dev
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