Update to 3.20. Changes since last version (3.15.1):

Changes to procmail:
   - SECURITY: don't do unsafe things from signal handlers:
      - ignore TRAP when terminating because of a signal
      - resolve the host and protocol of COMSAT when it is set
      - save the absolute path form of $LASTFOLDER for the comsat
        message when it is set
      - only use the log buffer if it's safe
   - Support LMTP for delivery mode (not enabled by default)
   - Preliminary support for using mmap() for `large' messages
     (this doesn't work yet)
   - SWITCHRC=zero-length-file didn't always abort the current
     rcfile
   - A race to create the mailspool would bounce one of the
     messages due to an internal error
   - LC_ in KEEPENV would preserve only the first LC_foo variable
   - Strip runtime linker variables (LD_*) from environment on
     all platforms
   - Drop duplicate and malformed environment entries
   - Multiple -a options will now set $2, $3, etc
   - Command line assignments to INCLUDERC and SWITCHRC no longer
     have any effect
   - Worked around AIX 4.3.3 xlc compiler (incorrect file-scope
     variable initialization)
   - When delivering to a maildir, don't force the message to end
     with an empty line
   - Be more paranoid about leaking information between recipients
   - Unset LOCKFILE if we can't actually lock it
   - Set MAILDIR to '.' if the chdir fails
   - LASTFOLDER was sometimes set by '?' conditions
   - Buffer the log more efficiently
   - Use the `standard' format for maildir filenames and retry
     on name collision
   - Rename by linking to prevent lossage
Changes to lockfile:
   - Include the system mailbox lockfile path in the -v output
   - Resist attempts to use a setuid lockfile command
   - Fix infinite loop on -l, -r, or -s flag with no value.
Documented formail's treatment of >From_ lines as continuations
   of the From_ line and warned of problems caused by non-RFC822
   field names like 'Old-From '
Clarified procmail's treatment of $@ and $#
Fixed a man page formatting problem
Use long, not off_t, with fseek()/ftell()
Increase our paranoia: start to use strlcat()
The default MAILDIR is now configurable separately from the
   default rcfile location
Include an RPM spec file in the examples directory for automated
   builds
Include and use mkinstalldirs
Called nice() when shouldn't have (this time for sure!)

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