Nginx 1.13.7

Changes with nginx 1.13.7 21 Nov 2017

*) Bugfix: in the $upstream_status variable.

*) Bugfix: a segmentation fault might occur in a worker process if a
backend retued a "101 Switching Protocols" response to a
subrequest.

*) Bugfix: a segmentation fault occurred in a master process if a shared
memory zone size was changed during a reconfiguration and the
reconfiguration failed.

*) Bugfix: in the ngx_http_fastcgi_module.

*) Bugfix: nginx retued the 500 error if parameters without variables
were specified in the "xslt_stylesheet" directive.

*) Workaround: "gzip filter failed to use preallocated memory" alerts
appeared in logs when using a zlib library variant from Intel.

*) Bugfix: the "worker_shutdown_timeout" directive did not work when
using mail proxy and when proxying WebSocket connections.

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