Remove obsolete Darwin clang tools am: 41ba7b6ef7 am: f4010b0a52 am: 1295529ddf am: 6187a24000

Original change: https://android-review.googlesource.com/c/platform/prebuilts/clang-tools/+/1884693

Change-Id: Ibbc9d36379c154c76b30cc1644984c6932cefee7