Update NDK prebuilts to build 8474149. am: ee71351fae

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

Change-Id: Ib08f7c22a13b6570a6b31f0ff61efc490a8661c4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>