lz4: upgraded package to upstream

Upgraded app-arch/lz4 to version 1.9.3.

BUG=None
TEST=CQ passes

Change-Id: I1d7b19c4fbe06e86661f5ec131c56dfc2d4a03ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2923066
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Sergey Frolov <sfrolov@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
4 files changed