MFH: r486071
Update from 1.15.6 to 1.15.7.
Update clojure and njs third-party modules to their recent versions.
Approved by: portmgr (miwi)
<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>