Allowing a user handler for segv is default in GN, but not in GYP. We pass it now explicitly to make the last gyp bot temporarily happy.

TBR=vogelheim@chromium.org

Bug: chromium:710409
Change-Id: Ib997245f348481158bd8d64192ac653b60237452
Reviewed-on: https://chromium-review.googlesource.com/474147Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#44578}