gnu: Rust: Export all versions.

* gnu/packages/rust.scm (rust-1.29, rust-1.30, rust-1.31, rust-1.32,
rust-1.33, rust-1.34, rust-1.35, rust-1.36, rust-1.37, rust-1.38, rust-1.39,
rust-1.40, rust-1.41, rust-1.42, rust-1.43, rust-1.44, rust-1.45, rust-1.46,
rust-1.47, rust-1.48): Export.
(rust): Rename to ....
rust-1.49): ... this.
(rust-1.50): Refer to RUST-1.49 instead of RUST.
(rust): Turn into alias for RUST-1.49.

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