am dfec8f89: am 50e99111: am 54bea362: Merge "Use aarch64-linux-android-4.9 for arm64 build (attempt #4)"

* commit 'dfec8f8915ea5870c5e43549a1230d33585b6d89':
  Use aarch64-linux-android-4.9 for arm64 build (attempt #4)