Make clang-sys available to product and vendor am: 51ac081bd7

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

Change-Id: Id4b5b3b8955aeaea13768b9c2ce997777e4550ef
Signed-off-by: Automerger Merge Worker <[email protected]>