nginx-devel: updated to 1.19.9

Changes with nginx 1.19.9                                        30 Mar 2021

    *) Bugfix: nginx could not be built with the mail proxy module, but
       without the ngx_mail_ssl_module; the bug had appeared in 1.19.8.

    *) Bugfix: "upstream sent response body larger than indicated content
       length" errors might occur when working with gRPC backends; the bug
       had appeared in 1.19.1.

    *) Bugfix: nginx might not close a connection till keepalive timeout
       expiration if the connection was closed by the client while
       discarding the request body.

    *) Bugfix: nginx might not detect that a connection was already closed
       by the client when waiting for auth_delay or limit_req delay, or when
       working with backends.

    *) Bugfix: in the eventport method.


Changes with nginx 1.19.8                                        09 Mar 2021

    *) Feature: flags in the "proxy_cookie_flags" directive can now contain
       variables.

    *) Feature: the "proxy_protocol" parameter of the "listen" directive,
       the "proxy_protocol" and "set_real_ip_from" directives in mail proxy.

    *) Bugfix: HTTP/2 connections were immediately closed when using
       "keepalive_timeout 0"; the bug had appeared in 1.19.7.

    *) Bugfix: some errors were logged as unknown if nginx was built with
       glibc 2.32.

    *) Bugfix: in the eventport method.


Changes with nginx 1.19.7                                        16 Feb 2021

    *) Change: connections handling in HTTP/2 has been changed to better
       match HTTP/1.x; the "http2_recv_timeout", "http2_idle_timeout", and
       "http2_max_requests" directives have been removed, the
       "keepalive_timeout" and "keepalive_requests" directives should be
       used instead.

    *) Change: the "http2_max_field_size" and "http2_max_header_size"
       directives have been removed, the "large_client_header_buffers"
       directive should be used instead.

    *) Feature: now, if free worker connections are exhausted, nginx starts
       closing not only keepalive connections, but also connections in
       lingering close.

    *) Bugfix: "zero size buf in output" alerts might appear in logs if an
       upstream server returned an incorrect response during unbuffered
       proxying; the bug had appeared in 1.19.1.

    *) Bugfix: HEAD requests were handled incorrectly if the "return"
       directive was used with the "image_filter" or "xslt_stylesheet"
       directives.

    *) Bugfix: in the "add_trailer" directive.

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