Update NDK prebuilts to build 8474149. am: ee71351fae am: 3313fbb9d1 am: 954f504b79 am: 250ab96741

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

Change-Id: Iaeb316a9305dc8463290003530626655c0b7e9f3
Signed-off-by: Automerger Merge Worker <[email protected]>