Fix Mac version for MacBookPro15,1

Change-Id: I2ddeb5c9bcf12efeccaf88cf24af109d97872507
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/1186616
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2 files changed