Update NDK prebuilts to build 8474149. am: ee71351fae am: 3313fbb9d1 am: 954f504b79

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

Change-Id: I19a775e2862509f83baa3c4e1002dffcae40d44f
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>