Relicense shootout-spectralnorm.rs to the shootout license

Everyone agreed.

Fix #17064
Relicense shootout-fasta.rs ti the shootout license.

Everyone agreed.

Fix #17072
auto merge of #17335 : TeXitoi/rust/relicense-shootout, r=brson

Everyone agreed.  Fix #17064, fix #17072 

@brson OK?