Add gsi openssh 10.0 from Fedora 43 current stable

[fscheiner]

The changes are based on:
https://kojipkgs.fedoraproject.org//packages/gsi-openssh/10.0p1/3.fc43/src/gsi-openssh-10.0p1-3.fc43.src.rpm

[fscheiner]

@msalle, @ellert, @maarten-litmaath:
So fortunately I found the time and also got it working yesterday. \o/

Reviewers, may I point you to the changes I made to:

• gsi_openssh/source/kex-names.c
• gsi_openssh/source/kexmlkem768x25519.c

This is the only really new change needed compared to 9.9p1 IIC. Fedora seems to have added additional code there that overrules the original OpenSSH Portable code, but also seems to require OpenSSL 3.0. In the long run we might run into problems trying to keep it buildable with OpenSSL < 3.0. So maybe we drop that in the next update, also because Rocky Linux 8 is covered by EPEL.

@ellert : There seems to be a small inconsistency, because from the source RPM I had the impression that this is based on OpenSSH 10.0p1 as per the filename, so modified gsi_openssh/version.m4 accordingly. But when tested, it identifies as 10.0p2, see below. But I can also adapt that accordingly everywhere, though this will then sort of contradict the source RPM's filename.

[fscheiner]

This is so far again only tested on Rocky Linux 8, testing on other distros is welcome, also if just tested to build and install there.

Rocky Linux 8

[johndoe@gridftp-5 gsi-openssh-10.0p1-testing]$ sudo ~/bin/test-gss-kex-for-gsi-openssh.bash gridftp-5.machine-hall.org johndoe2
[sudo] password for johndoe: 
gsisshd: OpenSSH_10.0p2c-GSI_hpn18.7.0 GSI, OpenSSL 1.1.1k  FIPS 25 Mar 2021
gsissh: OpenSSH_10.0p2c-GSI_hpn18.7.0 GSI, OpenSSL 1.1.1k  FIPS 25 Mar 2021

Wait 3 seconds for startup of gsisshd ...

gss-gex-sha1- OK ( plus johndoe => johndoe2 )
gss-group1-sha1- OK ( plus johndoe => johndoe2 )
gss-group14-sha256- OK ( plus johndoe => johndoe2 )
gss-nistp256-sha256- OK ( plus johndoe => johndoe2 )
gss-curve25519-sha256- OK ( plus johndoe => johndoe2 )
gss-group16-sha512- OK ( plus johndoe => johndoe2 )