Cleanup cargo2android configs and patches am: dab483f7b4

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/nix/+/2750927

Change-Id: I623f63cf35efed6dfde66fe305227ab70a9ab7b4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>