[PATCH] tzdata: Update to version 2026c

[Adolf Belka <adolf.belka@ipfire.org>]

- Update from version 2026b to 2026c
- No change to rootfile
- Changelog
2026c
  Briefly:
    Alberta moved to permanent -06 on 2026-06-18.
    Morocco moves to permanent +00 on 2026-09-20.
    More integer overflow bugs have been fixed in zic.
  Changes to future timestamps
    Alberta’s 2026-03-08 spring forward was its last foreseeable clock
     change, as it moved to permanent -06 thereafter.  (Thanks to Roozbeh
     Pournader and others.)  Model this with its traditional abbreviation
     CST.  Although the change to permanent -06 legally took place on
     2026-06-18, temporarily model the change to occur on 2026-11-01 at
     02:00 instead, for the same reason we introduced a similarly
     temporary hack for British Columbia in 2026b.
      Although another TZDB release will likely be needed soon because
       Northwest Territories will likely follow Alberta, the legal
       formalities have not yet taken place.
    Morocco plans to move back to permanent UTC, without daylight
     saving time transitions, on 2026-09-20 at 02:00.  This also
     affects Western Sahara.
  Changes to code
    zic no longer overflows integers when processing outlandish input
     like ‘Zone Ouch 0 - LMT 9223372036854775807’, ‘Zone Ouch 0
     2562047788015215 LMT’, ‘Zone Ouch -2562047788015215:30:08 - LMT’,
     and ‘Zone Ouch -2562047788015215:30:08 - %%z’.  This avoids
     undefined behavior in C.  (Problems reported by Naveed Khan.)
    On platforms that have EFTYPE, tzalloc now fails with errno set to
     EFTYPE, not EINVAL, if it detects that the TZif file has an
     invalid format or is not a regular file.  Formerly it did this
     only on NetBSD, and only when the file was not a regular file.
    Unprivileged programs no longer require TZif files to be regular
     files or reject relative names containing ".." components.  This
     reverts to the more-permissive 2025b behavior, as the stricter
     behavior did not catch on in FreeBSD.
    zic now reports any failure to remove a temporary file when
     cleaning up after a previous failure.  (Problem reported by Tom
     Lane.)
  Changes to commentary
    Northwest Territories is expected to move to permanent -06 prior to
     2026-11-01 02:00, when clocks would otherwise fall back.  (Thanks to
     Tim Parenti and James Bellaire.)  Model this with its traditional
     abbreviation CST.  Unfortunately the change is not yet official, so
     it is currently present only as comments that can be uncommented as
     needed.
  Changes to build procedure
    The undocumented ‘typecheck’ Makefile check rule has been removed.
     It stopped working in 2025a and evidently nobody noticed.
     The rule was superseded by ‘check_time_t_alternatives’ in 2013d.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
---
 lfs/tzdata | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lfs/tzdata b/lfs/tzdata
index e57625765..42b916af0 100644
--- a/lfs/tzdata
+++ b/lfs/tzdata
@@ -24,7 +24,7 @@
 
 include Config
 
-VER        = 2026b
+VER        = 2026c
 # https://data.iana.org/time-zones/releases/.tar.gx & .asc
 
 TZDATA_VER = $(VER)
@@ -47,8 +47,8 @@ objects = tzdata$(TZDATA_VER).tar.gz tzcode$(TZCODE_VER).tar.gz
 tzdata$(TZDATA_VER).tar.gz = $(DL_FROM)/tzdata$(TZDATA_VER).tar.gz
 tzcode$(TZCODE_VER).tar.gz = $(DL_FROM)/tzcode$(TZCODE_VER).tar.gz
 
-tzdata$(TZDATA_VER).tar.gz_BLAKE2 = 3134d88addaa6a53749a4c87aa5c1b9d4632478152c67a26e5d1cfcf97b4eaafac3b16a41e61840360d4bde5aa05701aeb1caaafcc8a006c7f4708cfa2ac686d
-tzcode$(TZCODE_VER).tar.gz_BLAKE2 = 89ac1ee3b79c596a4903b9c25a794b24fa8e6076e61fbd30c09c690bd002f3759c76afd303abb9d716efa08da216b64362ec06be0e2c60ee89fd6a5e7b397f17
+tzdata$(TZDATA_VER).tar.gz_BLAKE2 = 53a759b9081736b5daba8574b2f6a6852fcd0fbb85237d90e5c589f4126a445a9fbbf338383fc14cee09fa4bb38b546a8285adcbdd944d93eb7e1242cae8feda
+tzcode$(TZCODE_VER).tar.gz_BLAKE2 = 09939593ad33e894d7ad62f8a7e1ee09a4490143a4c744551f81e836eb1b63f96926d362e415d1e254d2fe2d52378017c190b027e1d99a00b94014a413e329dd
 
 install : $(TARGET)
 
-- 
2.55.0