Turn off /arch:AVX[2] on Windows builds.

This canaries a similar change Chrome may need.

BUG=chromium:666707

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=5005

Change-Id: Ibf7f9941968d905d865b9be1e63ebbf768870175
Reviewed-on: https://skia-review.googlesource.com/5005
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Klein <mtklein@chromium.org>
2 files changed