Undo previous change, X509_check_issued() was correct.

[See
     Message-ID: <3BB07999.30432AD2@celocom.com>
     Date: Tue, 25 Sep 2001 13:33:29 +0100
     From: Dr S N Henson <drh@celocom.com>
     To: openssl-dev@openssl.org
     Subject: Re: Error in v3_purp.c
]