Support FFDHE?

[John Jiang]

Hi,
It sounds FFDHE groups are already supported [1]
But the tools, like s_client, also support them.
Run the command: openssl s_client -tls1_3 -groups ffdhe2048 host:port
it just raised the issue: Error with command: "-groups ffdhe2048"
If using P-256 or X25519, it worked fine.

I also tried option "-groups FFDHE2048". The same error raised again.

[1] https://github.com/openssl/openssl/pull/8178
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