libselinux: upgraded package to upstream

Upgraded sys-libs/libselinux to version 2.4 on amd64
(actually adding rather than upgrading)

BUG=b:25408463
TEST=emerge

Change-Id: Iadad198a254ee3d82d189c598f4c8f08056ccadc
Reviewed-on: https://chromium-review.googlesource.com/324793
Commit-Ready: Ricky Zhou <rickyz@chromium.org>
Tested-by: Luigi Semenzato <semenzato@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
6 files changed