[Feature] Replace libdeflater with libdeflate-rsx in RecastXZ

libdeflate-rsx is a completely Rust-based port of libdeflate, containing no C code and not a Rust binding for any C dependencies.

Benchmark tests show that libdeflate-rsx and libdeflater are roughly the same speed, so I want to replace libdeflater.

Currently, libdeflate-rsx is still in testing. RecastXZ and KryptonFNP with libdeflate-rsx should be available within a week.