Relicense shootout-fasta-redux.rs to the shootout license.

Everyone agreed.

Fix #17078
auto merge of #17523 : TeXitoi/rust/relicense-shootout-fasta-redux, r=brson

Everyone agreed.

Fix #17078 

#14248 seems completed, as every src/test/bench/shootout-*.rs are relicensed after acceptation of this PR except:
- shootout-ackermann.rs: obsolete shootout bench
- shootout-fibo.rs:  obsolete shootout bench
- shootout-k-nucleotide-pipes.rs: slower that shootout-k-nucleotide-pipes.rs (and not so interesting as a benchmark)
- shootout-pfib.rs: does not seems related to the shootout

@brson OK?