relicense `shootout-reverse-complement.rs` to the shootout license

[TeXitoi]

See #14248

I propose to change the license of shootout-reverse-complement.rs

Non trivial contributors:

• @TeXitoi: OK
• @pcwalton: OK

Contributors appearing in git blame that are trivial:

• @fhahn: OK
• @alexcrichton: OK
• @brson: OK
• @kballard: OK
• @sfackler: OK

Contributors with removed and trivial contributions are not considered.

For the persons that are not in "OK" state, please respond to this issue saying:

I agree to relicense any previous contributions to http://github.com/rust-lang/rust according to the term of the Computer Language Benchmarks Game license (http://benchmarksgame.alioth.debian.org/license.php)

Then, I'll propose the corresponding PR.

Thanks.

[fhahn]

I agree to relicense any previous contributions to http://github.com/rust-lang/rust according to the term of the Computer Language Benchmarks Game license (http://benchmarksgame.alioth.debian.org/license.php)

Cheers

[sfackler]

I agree to relicense any previous contributions to http://github.com/rust-lang/rust according to the term of the Computer Language Benchmarks Game license (http://benchmarksgame.alioth.debian.org/license.php)