[openssl/openssl] f29066: Fix implementation of `PreferNoDHEKEX` option.

[Markus Minichmayr]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: f290663148ddddaffc0dc8737b08a244b49a76ba
      https://github.com/openssl/openssl/commit/f290663148ddddaffc0dc8737b08a244b49a76ba
  Author: Markus Minichmayr <markus at tapkey.com>
  Date:   2023-11-30 (Thu, 30 Nov 2023)

  Changed paths:
    M ssl/statem/extensions.c
    M ssl/statem/extensions_srvr.c

  Log Message:
  -----------
  Fix implementation of `PreferNoDHEKEX` option.

`tls_parse_ctos_key_share()` didn't properly handle the option.
Avoid the need to deal with the option in multiple places by properly
handling it in `tls_parse_ctos_psk_kex_modes()`.

Reviewed-by: Todd Short <todd.short at me.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22844)