xz-utils: upgraded package to upstream

Upgraded app-arch/xz-utils to version 5.2.3 on amd64, arm, x86

BUG=chromium:710066
TEST=for b in reef daisy x86-zgb; do
  FEATURES=test emerge-$b -q --nodeps xz-utils; done
Will also run through commit queue

Change-Id: Icd3399b442e321e680dfc21b1c46d04f75c8b647
Reviewed-on: https://chromium-review.googlesource.com/474066
Commit-Ready: Simon Glass <sjg@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Chirantan Ekbote <chirantan@chromium.org>
5 files changed