mbedtls: Warn if --tls-version-min is too low

mbedtls: Warn if --tls-version-min is too low

Recent versions of mbedtls only support TLS 1.2. When the minimum
version is set to TLS 1.0 or 1.1, log a warning and use 1.2 as the
actual minimum version.

Change-Id: Ibc641388d8016533c94dfef3618376f6dfa91f4e
Signed-off-by: Max Fillinger <maximilian.fillinger@foxcrypto.com>
Acked-by: Arne Schwabe <arne-openvpn@rfc2549.org>
Message-Id: <20240703174158.7137-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg28865.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>