[openssl/openssl] 7f4cc3: Remove restriction to only cross-sign self-signed ...

[openssl-machine]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 7f4cc3bc34e2fc1acf2abf1f2d791855c446c611
      https://github.com/openssl/openssl/commit/7f4cc3bc34e2fc1acf2abf1f2d791855c446c611
  Author: Yannik Sembritzki <yannik at sembritzki.org>
  Date:   2023-06-20 (Tue, 20 Jun 2023)

  Changed paths:
    M apps/x509.c

  Log Message:
  -----------
  Remove restriction to only cross-sign self-signed certificates

CLA: trivial

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Richard Levitte <levitte at openssl.org>
Reviewed-by: Paul Dale <pauli at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21137)