OpenSSL 3.0: fix dhgex for non-GCM ciphers for OpenSSL 3.0

[Marc Kleine-Budde]

Hello,

I'm interested in building openssh with openssl-3.0, mainly because it supports
offloading to linux ktls. I run into the following problem described here:

https://www.spinics.net/lists/openssh-unix-dev/msg06808.html

and the fix by Tom.III:

https://www.spinics.net/lists/openssh-unix-dev/msg06860.html

I took the patch and it works and decided to try up-streaming it. I added some
configure magic, so that the patches compiles with openssl-1.1.x and the
openssl-3 top-of-tree.

After reading the openssh github page, I decided to create a bugreport on
bugzilla and upload the patch there:

    https://bugzilla.mindrot.org/show_bug.cgi?id=3238

Is this the preferred way to contribute?

regards,
Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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