Delete obsolete clang prebuilts. am: 9dc07afe37

Original change: https://googleplex-android-review.googlesource.com/c/platform/prebuilts/clang/host/darwin-x86/+/23366231

Change-Id: I46e0d7f4c447f35605bcfd2ebd07e7508f2414c2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>