SSL: use of SSL_MODE_NO_AUTO_CHAIN.
SSL: use of SSL_MODE_NO_AUTO_CHAIN.

The SSL_MODE_NO_AUTO_CHAIN mode prevents OpenSSL from automatically
building a certificate chain on the fly if there is no certificate chain
explicitly provided.  Before this change, certificates provided via the
ssl_client_certificate and ssl_trusted_certificate directives were
used by OpenSSL to automatically build certificate chains, resulting
in unexpected (and in some cases unneeded) chains being sent to clients.

hy0kl/nginx,hy0kl/nginx,hy0kl/nginx