Stop using -std=gnu*

BUG=427584
R=thakis
TBR=sbc

Change-Id: I4a6f67aa6ddaf8ab78719a3c925fcd732b8c28bf
Reviewed-on: https://chromium-review.googlesource.com/1149337
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#581478}
5 files changed