RFR: 8328812: Update and move siphash license

[Bernd]

On Mon, 25 Mar 2024 20:34:06 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> The header file contains more claims https://github.com/veorq/SipHash/blob/master/halfsiphash.h
>
> That header only contains a single function declaration for an entry point into the implementation.
> HotSpot doesn't use that function, and doesn't have anything with a corresponding signature.  So it's
> not in any way derived from that header.  The HotSpot code is derived from the .c file only, so that's
> the license we should be referencing.

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

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PR Review Comment: https://git.openjdk.org/jdk/pull/18455#discussion_r1538209271