Update lrzsz to 0.12.20.

Notable changes include:

 Version 0.12.20 - December 1998, Uwe Ohse
 * works on BeOS and stone-aged SCO (sco-3.2v4.2)
 * pubdir-"feature" works again.
 * "make rpm" creates a rpm file.
 * "optimal blklen calculation" was too aggressive, it now does nothing
   if the user demands fixed blklens.
 * various smaller and medium bug fixes.
 * a more or less important security bug is fixed (stupid use of /tmp in
   a piece of code which is rarely used).
 * lrz uses umask to make files unreadable which receiving them.
 * "sh systype | mail uwe-generic-counter@ohse.de" sends a success report
    with a description of the system type.
 * --enable-syslog is now default

 Version 0.12.19 - January 1998, Uwe Ohse
 * 0.12.18 was broken, lsz crashed if receiver found an CRC error.
 * lrz options "--rename" and "--escape" didn't work.
 * lrz didn't implement senders "overwrite-or-skip" option.
 * added dejagnu testsuite. Maybe you need a dejagnu snapshot to use it.

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