Update NDK prebuilts to build 8474149. am: ee71351fae am: 051d5d4686

Original change: https://googleplex-android-review.googlesource.com/c/platform/prebuilts/ndk/+/17947822

Change-Id: If4e15f81c2b572af870ac552ec4ea8c49a6a8a70
Signed-off-by: Automerger Merge Worker <[email protected]>