Update NDK prebuilts to build 8474149. am: ee71351fae am: 3313fbb9d1 am: 44e35a40ec

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

Change-Id: I460ae66c9059e10501b35b3c83a1d10c59ec0352
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>