sys-apps/selinux-python: Add package and deps

Note that these dependencies include the fixes for two gentoo bugs:
https://bugs.gentoo.org/642634
https://bugs.gentoo.org/744487

Patches for these have been submitted upstream.

BUG=none
TEST=sudo emerge sys-apps/selinux-python

Change-Id: If11c5429d08130ab75912491e27b5200e69bba24
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2428484
Tested-by: Fergus Dall <sidereal@google.com>
Reviewed-by: Qijiang Fan <fqj@google.com>
Reviewed-by: Jorge Lucangeli Obes <jorgelo@chromium.org>
Commit-Queue: Fergus Dall <sidereal@google.com>
25 files changed