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

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

Change-Id: Ibc1b4b26ab8b2ba29d1bb0c91ba97c10171d81ec