libseccomp: upgraded package to upstream

Upgraded sys-libs/libseccomp to version 2.2.3 on amd64

BUG=b:29389897
TEST=Successfully built Docker 1.11.2 and tested its
     seccomp functionality.

Change-Id: Ic7dec75bc14f81b534b90a8e4f93b0fc0885900c
Reviewed-on: https://chromium-review.googlesource.com/353041
Commit-Ready: Saied Kazemi <saied@google.com>
Tested-by: Saied Kazemi <saied@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
6 files changed