GitLab

This change adds ARM64 Windows support to the configure/GNI-generation
script for libvpx and adds the generated config files.

Bug: 893460
Change-Id: I2b58bca3ac1e2650f68dd82495fa3bb5f44b88a7
Reviewed-on: https://chromium-review.googlesource.com/c/1332732Reviewed-by: James Zern <jzern@chromium.org>
Reviewed-by: Johann Koenig <johannkoenig@google.com>
Commit-Queue: James Zern <jzern@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613379}