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

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

Change-Id: I081ace5d6620f0b80c698217dc5aba016841dc96