t-Rust

so NetBSD/amd64 is a tier 2 target for Rust.

• who builds it where?

• what NetBSD version(s) is it for?

• what are the issues with the Rust-project supplied version?

• are TNF members involved with Rust, if yes who?

• Tier1: do we want to get there, what would we need to do to get there?

• how do we get Rust packages for other arches?