Add post_update.sh am: daef00fd01 am: 565e216014 am: efcbcebf7f am: 01e9d937b4

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/proc-macro-nested/+/1434798

Change-Id: Ie8f3db5c8db282841fae218ee7865f8b211470ef