ARROW-8735: [Rust] [Parquet] Allow arm 32 to use soft hash implementation #8338
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Minimal change to allow this to be used on arm 32 targets.
A better solution may be to utilise the crc32 instruction ala the optimised intel implementation but this is better than nothing. There should probably be a crate we could just import the hash implementation from rather than having to repeat optimisations everywhere.