backporting sntrup761x25519-sha512 key exchange to OpenSSH 8.9-9.8

[Damien Miller]

On Tue, 12 Aug 2025, Colin Watson wrote:

> On Tue, Aug 12, 2025 at 11:33:28AM +0100, Colin Watson wrote:
> > Any reason you didn't include the documentation changes from
> > https://anongit.mindrot.org/openssh.git/commit/?id=aee54878255d71bf93aa6e91bbd4eb1825c0d1b9
> > as well?  Encouraging distributors to keep that in sync seems like a good
> > idea (and when I cherry-picked the new alias into Debian I included the
> > documentation changes).
> 
> FWIW I happened to notice that the commit on V_9_8 contains what seems
> to be some unrelated changes to the man pages (as opposed to the related
> changes that I think should be included).  Probably harmless, but it might
> confuse any relevant distributors slightly.
> 
>   https://anongit.mindrot.org/openssh.git/commit/?h=V_9_8&id=26f73db15e0eee558a11b42a9d794d78c87dd11e

Thanks for pointing this out; I've backed these out.

-d