Python's hashlib now unconditionally uses the vendored HACL* library for
Blake2. Python no longer accepts libb2 as an optional dependency for Blake2.
We refreshed HACL* to the latest version, and now vendor HACL*'s 128-bit and
256-bit wide vector implementations for Blake2, which are used on x86/x64
toolchains when the required CPU features are available at runtime.
HACL*'s 128-bit wide vector implementation of Blake2 can also run on ARM
NEON and Power8, but lacking evidence of a performance gain, these are not
enabled (yet).
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