Generate rules.mk for thiserror-impl with cargo_embargo

Adjust cargo_embargo.json and run cargo_embargo. Due to changes in the
cargo_embargo logic, a non-functional change is made to the blueprint.

Bug: 367477170
Test: build.py generic-x86_64-test --skip-tests
Change-Id: I5d7bf499bec22dd9903cf8c0c7b8668558b131b8
3 files changed