touch_updater: add openat to seccomp if open is there.

This adds openat to a seccomp policy file if open is already there.
We need this because glibc 2.25 changed it system call for open().

BUG=chromium:894614
TEST=None

Change-Id: I9db2383cf297b379fb625d15c2593a62ca1bd41b
Reviewed-on: https://chromium-review.googlesource.com/1290207
Commit-Ready: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Yunlian Jiang <yunlian@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
14 files changed
tree: f1bbd14ccd1d26e870a854650528e66d70375034
  1. host_scripts/
  2. policies/
  3. scripts/
  4. LICENSE
  5. OWNERS
  6. README