Upgrade from 1.11.7 to 1.11.8.

<ChangeLog>

*) Feature: the "absolute_redirect" directive.

*) Feature: the "escape" parameter of the "log_format" directive.

*) Feature: client SSL certificates verification in the stream module.

*) Feature: the "ssl_session_ticket_key" directive supports AES256

encryption of TLS session tickets when used with 80-byte keys.

*) Feature: vim-commentary support in vim scripts.

Thanks to Armin Grodon.

*) Bugfix: recursion when evaluating variables was not limited.

*) Bugfix: in the ngx_stream_ssl_preread_module.

*) Bugfix: if a server in an upstream in the stream module failed, it

was considered alive only when a test connection sent to it after
fail_timeout was closed; now a successfully established connection is
enough.

*) Bugfix: nginx/Windows could not be built with 64-bit Visual Studio.

*) Bugfix: nginx/Windows could not be built with OpenSSL 1.1.0.

</ChangeLog>