Build libyuv for iOS
gn additional_target_cpus does not work for libyuv. I created a build script to generate fat ios static library for arm/arm64/x64.
last commit id:
commit d82f4baf5fcc19f21b5decd7c4af63f120653e0b
Author: Frank Barchard <fbarchard@google.com>
Date: Wed Nov 13 11:42:38 2019 -0800