[issue20162] Test test_hash_distribution fails on RHEL 6.5 / ppc64

[STINNER Victor]

STINNER Victor added the comment:

> Only MSVC produces slow code, but Windows works only on platforms where unaligned access is not an issue.

My patch uses Py_MEMCPY() which uses a loop to copy bytes on Visual
Studio for length smaller than 16 bytes (SipHash copies 4 bytes).

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