Merge branch 'am/xdiff-hash-tweak'

Inspired by Ezekiel's recent effort to showcase Rust interface, the hash function implementation used to hash lines have been updated to the one used for ELF symbol lookup by Glibc. * am/xdiff-hash-tweak: xdiff: optimize xdl_hash_record_verbatim xdiff: refactor xdl_hash_record()