hash function for suunto solution

[Kristaps Dzonsons]

Hi,

The Suunto Solution seems to be the only dc that doesn't support
fingerprints.  This annoys me because I can't fully rely on
dc_device_set_fingerprint(3) and I like that function.

So I've added a hash function that creates a suunto solution
fingerprint, then added the infrastructure to set, compare, and pass to
the caller.

Caveat emptor! I haven't tested it because I don't have a suunto solution.

Downsides to using a hash function?  It might be duplicated.  However,
given that this is a 128 bit hash, that's not terribly likely.

If this is ok, I can update the docs to reflect that setting the
fingerprint is fully supported.


Best,

Kristaps
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