OpenSSL: remove EVP_CIPHER_CTX_free() from the compat layer

OpenSSL: remove EVP_CIPHER_CTX_free() from the compat layer

For unknown reason, the writer of the compat layer seemed to think that
this function was only present in OpenSSL 1.1. This is not the case at
all, since it has been introduced in OpenSSL before version 0.9.8.

Thus, there is no need to add this function to the compat layer, and it
can be safely removed.

Signed-off-by: Emmanuel Deloget <logout@free.fr>
Acked-by: Steffan Karger <steffan.karger@fox-it.com>
Message-Id: <20170629142119.29502-2-logout@free.fr>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg14988.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 7ee9a94fcbbde941bfed167229a64df0f7cdae0b)