Enable usage of TLS groups not identified by a NID in OpenSSL 3

Enable usage of TLS groups not identified by a NID in OpenSSL 3

OpenSSL3 prefers to specify groups (including EC groups) with names
instead of NID to allow also groups provided by providers.
This commit also removes the mapping of secp256r1 to prime256v1 for
the OpenSSL3 code path as OpenSSL 3.0 recognises secp256r1.1

Signed-off-by: Michael Baentsch <info@baentsch.ch>
Acked-by: Arne Schwabe <arne@rfc2549.org>
Message-Id: <20220329053709.19462-1-info@baentsch.ch>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg24012.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>