net-print/cups: Add getrandom to the syscall filter

gnutls now uses getrandom after the update to 3.5.15. Get random
is used to seed the RNG.

BUG=chromium:814340
TEST=platform_AddPrinter.generic on cave and veyron_minnie

Change-Id: I1f27708d886b3803116585f0a7d6c6d2dbcf79e1
Reviewed-on: https://chromium-review.googlesource.com/961242
Commit-Ready: Sean Kau <skau@chromium.org>
Tested-by: Sean Kau <skau@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
4 files changed