Update clang-sys to 1.3.1 am: 82e2b17c88 am: 857fe23a37 am: 321d79a2aa am: ab7b7e0721

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/clang-sys/+/2005910

Change-Id: I4ca41005cd90b0332de5f3bfb0a150e4707a1f0c