Update from 0.8.6 to 0.8.7.

<ChangeLog>

*) Change: minimum supported OpenSSL version is 0.9.7.

*) Change: the "ask" parameter of the "ssl_verify_client" directive was
   changed to the "optional" parameter and now it checks a client
   certificate if it was offered.
   Thanks to Brice Figureau.

*) Feature: the $ssl_client_verify variable.
   Thanks to Brice Figureau.

*) Feature: the "ssl_crl" directive.
   Thanks to Brice Figureau.

*) Feature: the "proxy" parameter of the "geo" directive.

*) Feature: the "image_filter" directive supports variables for setting
   size.

*) Bugfix: the $ssl_client_cert variable usage corrupted memory; the
   bug had appeared in 0.7.7.
   Thanks to Sergey Zhuravlev.

*) Bugfix: "proxy_pass_header" and "fastcgi_pass_header" directives did
   not pass to a client the "X-Accel-Redirect", "X-Accel-Limit-Rate",
   "X-Accel-Buffering", and "X-Accel-Charset" lines from backend
   response header.
   Thanks to Maxim Dounin.

*) Bugfix: in handling "Last-Modified" and "Accept-Ranges" backend
   response header lines; the bug had appeared in 0.7.44.
   Thanks to Maxim Dounin.

*) Bugfix: the "[alert] zero size buf" error if subrequest returns an
   empty response; the bug had appeared in 0.8.5.

</ChangeLog>

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