Update rust to 1.34.0 and extract cargo package
You can find the release notes on the Rust blog:
- Enable i686 target
I also want to thank @Girtablulu for the initial assistance.
Test Plan: Successfully built bat and librsvg with local rust and cargo.
Reviewers: Triage Team, JoshStrobl
Reviewed By: Triage Team, JoshStrobl
Subscribers: JoshStrobl, Girtablulu
Differential Revision: https://dev.getsol.us/D5642