nginx @1.9.0: update to 1.9.4

[Schamschula (Marius Schamschula)]

nginx has been updated to version 1.9.4:

• Change: the "proxy_downstream_buffer" and "proxy_upstream_buffer" directives of the stream module are replaced with the "proxy_buffer_size" directive.
• Feature: the "tcp_nodelay" directive in the stream module.
• Feature: multiple "sub_filter" directives can be used simultaneously.
• Feature: variables support in the search string of the "sub_filter" directive.
• Bugfix: old worker processes might hog CPU after reconfiguration with a large number of worker_connections.
• Bugfix: a segmentation fault might occur in a worker process if the "try_files" and "alias" directives were used inside a location given by a regular expression; the bug had appeared in 1.7.1.
• Bugfix: the "try_files" directive inside a nested location given by a regular expression worked incorrectly if the "alias" directive was used in the outer location.
• Bugfix: in hash table initialization error handling.

Obsoletes #48388

[ryandesign (Ryan Carsten Schmidt)]

Thanks. Committed in r139721.