No support for 32-bit avx2 causes errors on i686 architectures

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Problem

We use the avx2 module on 32 and 64 bit systems here:

b64-ct/src/lib.rs

Line 66 in bd37b72

#[cfg(any(target_arch = "x86", target_arch = "x86_64"))]

But there is no support for avx2 on 32-bit i686 since the import here is 64-bit specific:

b64-ct/src/avx2.rs

Line 7 in bd37b72

use core::arch::x86_64::*;

This causes compilation to fail for i686 targets, for example cargo build --target=i686-unknown-linux-gnu

Fix

Either support a 32-bit variant or turn off on 32-bit systems