lang/rust: Update to 1.45.1
- Apply the "hard links break env::current_exe()" workaround from r543251 to lang/rust too
- Force rebuild all consumers for the soundness bug in 1.45.0
Changes: https://blog.rust-lang.org/2020/07/30/Rust-1.45.1.html
With hat: rust
Differential Revision: https://reviews.freebsd.org/D25835