options.c: fix version reported in --cipher warning message

options.c: fix version reported in --cipher warning message

BF-CBC is the default value for the --cipher option in OpenVPN <2.5
and not <2.6. However, the warning printed to screen talks about
"OpenVPN before 2.6", which is wrong and needs to be fixed.

Fix message by saying ".. before 2.5"

Cc: Arne Schwabe <arne@rfc2549.org>
Signed-off-by: Antonio Quartulli <a@unstable.cc>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <20211229172714.6424-1-a@unstable.cc>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg23477.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>