Make clang-sys available to product and vendor am: 51ac081bd7 am: 4e5d4b2430 am: 22500bd136 am: d87359cff0

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/clang-sys/+/2476344

Change-Id: Ibe5975f69bd22b360b3b7c6002581740f868de4c
Signed-off-by: Automerger Merge Worker <[email protected]>