Update from 0.6.17 to 0.6.21.

<ChangeLog>

Changes with nginx 0.6.21                                        03 Dec 2007

    *) Change: if variable values used in a "proxy_pass" directive contain
       IP-addresses only, then a "resolver" directive is not mandatory.
       resolver

    *) Bugfix: a segmentation fault might occur in worker process if a
       "proxy_pass" directive with URI-part was used; bug appeared in
       0.6.19.

    *) Bugfix: if resolver was used on platform that does not support
       kqueue, then nginx issued an alert "name is out of response".
       Thanks to Andrei Nigmatulin.

    *) Bugfix: if the $server_protocol was used in FastCGI parameters and a
       request line length was near to the "client_header_buffer_size"
       directive value, then nginx issued an alert "fastcgi: the request
       record is too big".

    *) Bugfix: if a plain text HTTP/0.9 version request was made to HTTPS
       server, then nginx returned usual response.

Changes with nginx 0.6.20                                        28 Nov 2007

    *) Bugfix: a segmentation fault might occur in worker process if a
       "proxy_pass" directive with URI-part was used; bug appeared in
       0.6.19.

Changes with nginx 0.6.19                                        27 Nov 2007

    *) Bugfix: the 0.6.18 version could not be built.

Changes with nginx 0.6.18                                        27 Nov 2007

    *) Change: now the ngx_http_userid_module adds start time microseconds
       to the cookie field contains a pid value.

    *) Change: now the full request line instead of URI only is written to
       error_log.

    *) Feature: variables support in the "proxy_pass" directive.

    *) Feature: the "resolver" and "resolver_timeout" directives.

    *) Feature: now the directive "add_header last-modified ''" deletes a
       "Last-Modified" response header line.

    *) Bugfix: the "limit_rate" directive did not allow to use full
       throughput, even if limit value was very high.

</ChangeLog>

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