[openssl/openssl] 7698f8: Add missing genpkey -rand support

[openssl-machine]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 7698f80ab17190be8d6950d8836222a375245ed8
      https://github.com/openssl/openssl/commit/7698f80ab17190be8d6950d8836222a375245ed8
  Author: Viktor Dukhovni <openssl-users at dukhovni.org>
  Date:   2024-01-16 (Tue, 16 Jan 2024)

  Changed paths:
    M apps/genpkey.c
    M doc/man1/openssl-genpkey.pod.in

  Log Message:
  -----------
  Add missing genpkey -rand support

Reviewed-by: David von Oheimb <david.von.oheimb at siemens.com>
Reviewed-by: Matt Caswell <matt at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23294)