update exim to 4.52.

summary of changes since 4.51 (general bug fixes and portability
fixes ommitted for brevity, see the ChangeLog for details):

Exim version 4.52
-----------------

TF/01 Added support for Client SMTP Authorization. See NewStuff for details.

PH/02 Reduce the amount of output that "make" produces by default. Full output
      can still be requested.

PH/04 Installed a modified version of Tony Finch's patch to make submission
      mode fix the return path as well as the Sender: header line, and to
      add a /name= option so that you can make the user's friendly name appear
      in the header line.

TF/03 Added the control = fakedefer ACL modifier.

TF/04 Added the ratelimit ACL condition. See NewStuff for details. Thanks to
      Mark Lowes for thorough testing.

TK/02 Rewrote SPF support to work with libspf2 versions >1.2.0.

TK/03 Merged latest SRS patch from Miles Wilton.

TK/04 Added simple SPF lookup method in EXPERIMENTAL_SPF. See NewStuff for
      details. Thanks to Chris Webb <chris@arachsys.com> for the patch!

PH/07 Added "fullpostmaster" verify option, which does a check to <postmaster>
      without a domain if the check to <postmaster@domain> fails.

SC/01 Eximstats: added -xls and the ability to specify output files
     (patch written by Frank Heydlauf).

SC/02 Eximstats: use FileHandles for outputing results.

SC/03 Eximstats: allow any combination of xls, txt, and html output.

SC/06 Eximstats: added the -include_original_destination flag

TK/06 MBOX spool code: Add real "From " MBOX separator line
      so the .eml file is really in mbox format (even though
      most programs do not really care). Patch from Alex Miller.

TK/07 MBOX spool code: Add X-Envelope-From: and X-Envelope-To: headers.
      The latter is generated from $received_to and is only set if the
      message has one envelope recipient. SA can use these headers,
      obviously out-of-the-box. Patch from Alex Miller.

PH/11 Upgraded appendfile so that quotas larger than 2G are now supported.
      This involved changing a lot of size variables from int to off_t. It
      should work with maildirs and everything.

PH/12 Applied Alex Kiernan's patch for the API change for the error callback
      function for BDB 4.3.

PH/13 Changed auto_thaw such that it does not apply to bounce messages.

PH/14 Imported PCRE 6.0; this was more than just a trivial operation because
      the sources for PCRE have been re-arranged and more files are now
      involved.

PH/16 Applied Matthew Newton's patch to exicyclog: "If log_file_path is set in
      the configuration file to be ":syslog", then the script "guesses" where
      the logs files are, rather than using the compiled in default. In our
      case the guess is not the same as the compiled default, so the script
      suddenly stopped working when I started to use syslog. The patch checks
      to see if log_file_path is "". If so, it attempts to read it from exim
      with no configuration file to get the compiled in version, before it
      falls back to the previous guessing code."

TK/09 Added "prvs" and "prvscheck" expansion items. These help a lot with
      implementing BATV in an Exim configuration. See NewStuff for the gory
      details.

PH/18 If the "use_postmaster" option was set for a recipient callout together
      with the "random" option, the postmaster address was used as the MAIL
      FROM address for the random test, but not for the subsequent recipient
      test. It is now used for both.

PH/19 Applied Michael Haardt's patch to update Sieve to RFC3028bis. "The
      patch removes a few documentation additions to RFC 3028, because the
      latest draft now contains them. It adds the new en;ascii-case comparator
      and a new error check for 8bit text in MIME parts. Comparator and
      require names are now matched exactly. I enabled the subaddress
      extension, but it is not well tested yet (read: it works for me)."

PH/23 Added daemon_startup_retries and daemon_startup_sleep.

PH/24 Added ${if match_ip condition.

PH/28 Changed -d+all to exclude +memory, because that information is very
      rarely of interest, but it makes the output a lot bigger. People tend to
      do -d+all out of habit.

PH/30 Exim's DNS code uses the original T_xxx names for DNS record times. These
      aren't the modern standard, and it seems that some systems' include files
      don't always have them. Exim was already checking for some of the newer
      ones like T_AAAA, and defining it itself. I've added checks for all the
      record types that Exim uses.

TK/11 Domainkeys: Change the logic how the "testing" policy flag is retrieved
      from DNS. If the selector record carries the flag, it now has
      precedence over the domain-wide flag.

SC/09 Eximstats: added the -show_rt<list> and the -show_dt<list> flags
      as requested by Marc Sherman.

SC/10 Eximstats: added histograms for user specified patterns as requested
      by Marc Sherman.

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