Fix build with mbedtls w/o SSL renegotiation support

Fix build with mbedtls w/o SSL renegotiation support

In mbedtls, support for SSL renegotiation can be disabled at
compile-time. However, OpenVPN cannot be built with such a library
because it calls mbedtls_ssl_conf_renegotiation() to disable this
feature at runtime. This function doesn't exist when mbedtls was built
without support for SSL renegotiation.

This commit fixes the build by ifdef'ing out the function call when
mbedtls was built without support for SSL renegotiation.

Signed-off-by: Max Fillinger <maximilian.fillinger@foxcrypto.com>
Acked-by: Antonio Quartulli <antonio@openvpn.net>
Message-Id: <E1lW0eX-00012w-9n@sfs-ml-1.v29.lw.sourceforge.com>
URL: https://www.mail-archive.com/search?l=mid&q=E1lW0eX-00012w-9n@sfs-ml-1.v29.lw.sourceforge.com
Signed-off-by: Gert Doering <gert@greenie.muc.de>