debug/strace: 4.6 requires xz

strace 4.6 is only available as an XZ-compressed tarball.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@anciens.enib.fr>
(transplanted from d878322997095e513c6311ec3713b83ca91e5d8c)

#!/bin/sh

set -e

printf "Running autoconf...\n"

autoconf -Wall --force

printf "Done. You may now run:\n    ./configure\n"