Re: pgsql: Sync our copy of the timezone library with IANA release tzcode20

Hi Tom,
(moving to -hackers)

On Wed, Jul 17, 2019 at 10:26:45PM +0000, Tom Lane wrote:
> Sync our copy of the timezone library with IANA release tzcode2019b.
> 
> A large fraction of this diff is just due to upstream's somewhat
> random decision to rename a bunch of internal variables and struct
> fields.  However, there is an interesting new feature in zic:
> it's grown a "-b slim" option that emits zone files without 32-bit
> data and other backwards-compatibility hacks.  We should consider
> whether we wish to enable that.

This is causing a compilation warning on Windows:
https://buildfarm.postgresql.org/cgi-bin/show_stage_log.pl?nm=whelk&dt=2019-07-19%2001%3A41%3A13&stg=make

"C:\buildfarm\buildenv\HEAD\pgsql.build\pgsql.sln" (Standardziel) (1)
->
"C:\buildfarm\buildenv\HEAD\pgsql.build\zic.vcxproj" (Standardziel)
(72) ->
 src/timezone/zic.c(2401): warning C4804: '-' : unsafe use of type
  'bool' in operation
[C:\buildfarm\buildenv\HEAD\pgsql.build\zic.vcxproj]

Buildfarm members using VS like whelk complains about that, and I can
see the warning myself.
--
Michael