[tz] Joda-Time compiler broken again

[Robert Elz]

    Date:        Sun, 27 Dec 2020 18:52:09 -0800
    From:        Paul Eggert <eggert at cs.ucla.edu>
    Message-ID:  <380c4727-0aac-c7c5-7914-5e045442f44e at cs.ucla.edu>

  | It is odd that Joda-Time handles "Jul 31 24:00" correctly (as this has 
  | been in tzdb since 2014e for the Egypt rule), but it mishandles "May 31 
  | 24:00u" in 2020e. I guess the trailing "u" is part of what triggers the bug.

More likely that the actual problem is a failed/misplaced error check,
and that it worked before because August has 31 days, and not this time,
because June does not.

kre