Update to 2.23beta1, as requested in pkg/17251 by Oliver Tonnhofer.

Changes since 2.21b:
* Added some Microsoft MIME types (Kevin Day).
* Switch htpasswd from using tmpnam to mkstemp.
* Rewrote figure_mime() to do binary search.
* Removed the x- from gzip and compress in mime_encodings.txt.
* Added rudimentary option to set cache-control headers.
* Simplified the IPv6 ifdefs.
* Allow filenames with ? in them (Cameron Gregory).
* Some improvements to the mmap cache - added a "panic mode" if you run out
  of address space, added DESIRED_MAX_MAPPED_BYTES config.h option.
* Lowered OCCASIONAL_TIME from five minutes to two minutes.
* Fix CGI variable AUTH_TYPE (Alexandre CHERIF).
* Split clear_connection() into two routines, one which sends a possible
  buffered response and the other which ignores such (David Burgess).
* Remove /./ in de_dotdot() (Dana Dahlstrom).
* Shortened LINGER_TIME from two seconds to half a second.
* Changed some write() calls to httpd_write_fully(), as suggested by
  Neale Pickett.
* Changed the non-mmap() read() call in mmc.c to httpd_read_fully(), as
  suggested by Cameron Gregory.
* Added an madvise(MADV_SEQUENTIAL) call in mmc.c.
* Added .xhtml and .xht to mime_types.txt (suggested by Dave Hodder).
* Added index.xhtml and index.xht to INDEX_NAMES (suggested by Dave Hodder).
* Got rid of the custom-jiggered syslog.c, now we just use the standard
  system version. Also added a paragraph in the man page about the syslogd
  flags needed to make syslogging work from inside a chroot tree.
* Added some OpenOffice MIME types (Dave Hodder).
* Lowered the default DESIRED_MAX_MAPPED_FILES from 2000 to 1000.
* Set up accept filters after listen() (Kris Spinka).
* Preserve query string when doing a missing-slash directory redirect.
* Special-case logging to '-' as stdout (Matt Armstrong).
* Added -s to usage line (Pavel Janík).
* Fix for security hole that exposed contents of .htpasswd in some cases
  (noticed by zeno@cgisecurity.com).
* Allow (and ignore) extra fields in .htpasswd files.
* Added some calls to shutdown() in strategic places.
* Added a timer-kill of the CGI interpose input and output process.
  These processes also now close the listen fd(s).
* Fixed rare file descriptor leak, when we get an unknown sockaddr family
  (George Schlossnagle).
* Put virtual hostname in non-local referer syslog (Craig Leres).
* Added a P3P server privacy header setting (Henrik Schack Jensen).
And lots of other bug fixes.

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