Update from 1.15.6 to 1.15.7.

Update clojure and njs third-party modules to their recent versions.

MFH:		2018Q4

<ChangeLog>

*) Feature: the "proxy_requests" directive in the stream module.

*) Feature: the "delay" parameter of the "limit_req" directive.
   Thanks to Vladislav Shabanov and Peter Shchuchkin.

*) Bugfix: memory leak on errors during reconfiguration.

*) Bugfix: in the $upstream_response_time, $upstream_connect_time, and
   $upstream_header_time variables.

*) Bugfix: a segmentation fault might occur in a worker process if the
   ngx_http_mp4_module was used on 32-bit platforms.

</ChangeLog>

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