RFR: 8328812: Update and move siphash license

[Bernd]

On Mon, 25 Mar 2024 22:23:03 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

>> The problem is that the project is a joined work and has multiple variants of copyrights (see the readme). I don’t think it’s on the safe side to pick a single (non recent) copyright - especially if you change attribution after the fact. But that’s just me. This is especially a problem because the file does NOT contain a dual license claim - the claim is in the readme with this text:
>> 
>>> Intellectual property
>> 
>>> This code is copyright (c) 2014-2023 Jean-Philippe Aumasson, Daniel J. Bernstein. It is dual-licensed [CC0](https://github.com/veorq/SipHash/blob/master/LICENCE_CC0) and [MIT](https://github.com/veorq/SipHash/blob/master/LICENSE_MIT).
>
> Copyright and license are two different things. The project has a dual license which we attribute. Code in different files can have different copyrights (as is the case in e.g. our own OpenJDK code). We copied the copyright from the file that we looked at. If you feel it has the wrong copyright please contact the authors of that file and ask them to update their code.

The file has a different license also. Either you use the joined copyright and dual license or only the single copyright and cc0 license which is in the file. But I asked DJB to clarify.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18455#discussion_r1538369236