Constant hash_roll::buzhash_table::BORG_BUZHASH_BASE

pub const BORG_BUZHASH_BASE: [u32; 256];

https://github.com/borgbackup/borg/blob/master/src/borg/_chunker.c#L30-L64

Note that borg does not use this directly, it xors it with a 32bit seed prior to use