[automerger skipped] Delete obsolete clang prebuilts. am: 9dc07afe37 am: 51b3a3cd85 am: dffb425151 -s ours am: b67b981d54 -s ours

am skip reason: Merged-In I5374daefc5b33cf1bb1dce70d4b1602fcf8787f8 with SHA-1 9dc07afe37 is already in history

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

Change-Id: I8959389fdee5191cc4db98d4bcd763fe35896390
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>