bpo-31933: fix blake2 multi-byte params on big endian platforms (GH-4250) (#4262)

All Blake2 params have to be encoded in little-endian byte order. For
the two multi-byte integer params, leaf_length and node_offset, that
means that assigning a native-endian integer to them appears to work on
little-endian platforms, but gives the wrong result on big-endian. The
current libb2 API doesn't make that very clear, and @sneves is working
on new API functions in the GH issue above. In the meantime, we can work
around the problem by explicitly assigning little-endian values to the
parameter block.

See https://github.com/BLAKE2/libb2/issues/12.
(cherry picked from commit dcfb0e3c04f1b29a0d09bb0a81dcd5ee5a5fef1a)

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