Upgrade clang-sys to 1.4.0 am: 3dc8c53f43 am: 71a5eb55c3 am: 540e83d392

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/clang-sys/+/2335402

Change-Id: Ie051502f376426787378edc68930ab67725af852
Signed-off-by: Automerger Merge Worker <[email protected]>