FYI: fix for big-endian systems pushed to V_9_9 branch

[Damien Miller]

Hi,

This is mostly a note for downstream distributors of OpenSSH. I've
just pushed fixes to the V_9_9 stable branch for a bug in the
mlkem768x25519-sha256 key exchange algorithm that was added in this
release that causes connection failures when connecting between
big-endian and little-endian hosts.

The problem is on the big-endian side. No change is required for
the more common little-endian architectures (e.g. x86, ARM).

If you distribute OpenSSH to big-endian systems and have packaged
OpenSSH 9.9 already, then I recommend you include these fixes as the
next release of OpenSSH will make this key exchange algorithm the
default.

Thanks,
Damien
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