The following revision refers to this bug:
  https://chromium.googlesource.com/chromiumos/overlays/chromiumos-overlay/+/683f22bd6cfac67c2b6566dcd14cc4dc7513bf05

commit 683f22bd6cfac67c2b6566dcd14cc4dc7513bf05
Author: Yunlian Jiang <yunlian@google.com>
Date: Sat Jul 07 01:48:41 2018

conntrack-tools: make it builds with glibc 2.27

glibc 2.27 has dropped the header file rpc/rpc_msg.h and conntrack-tools
still needs this header file.
This backports gentoo commit
commit d94fc3980f778d1d88ec93f83b0b4ebb41a3fe14
Author: Andreas K. Httel <dilfridge@gentoo.org>
Date:   Sun Sep 24 22:16:18 2017 +0200

    net-firewall/conntrack-tools: Add support for libtirpc, bug 631902

    Closes: https://bugs.gentoo.org/631902

BUG= chromium:859548 
TEST=emerge-samus conntrack-tools

Change-Id: If93d62ebb8ac756c7b3aebdc1a365e56ac267db9
Reviewed-on: https://chromium-review.googlesource.com/1122959
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Caroline Tice <cmtice@chromium.org>

[rename] https://crrev.com/683f22bd6cfac67c2b6566dcd14cc4dc7513bf05/net-firewall/conntrack-tools/conntrack-tools-1.4.4-r8.ebuild
[modify] https://crrev.com/683f22bd6cfac67c2b6566dcd14cc4dc7513bf05/net-firewall/conntrack-tools/conntrack-tools-1.4.4.ebuild
[add] https://crrev.com/683f22bd6cfac67c2b6566dcd14cc4dc7513bf05/net-firewall/conntrack-tools/files/conntrack-tools-1.4.4-rpc.patch