Make memchr available to product and vendor am: ae75378e8c

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/memchr/+/2475775

Change-Id: I1a3f22a18cd4955cce3e5e7a553170241a77a72d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>