Allow test-crypto to work without the --secret argument

Allow test-crypto to work without the --secret argument

The --test-crypto still requires the --secret argument. Since --secret
will be removed in OpenVPN 2.8 but we want to keep test-crypt, remove
the dependency of test-crypto on --static.

Instead we will just generate a random key for this selftest method.
This also removes the extra logic that is a leftover from the early
multi-thread implementation attempt.

Change-Id: I72947bd4f0213fd118327f740daeb1d86ae166de
Signed-off-by: Arne Schwabe <arne@rfc2549.org>
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1435
Message-Id: <20251219135110.166468-1-frank@lichtenheld.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg35157.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>