Fix tests to cope with updates in tzdata

Backported-by: Antonio Terceiro <terceiro@debian.org>
See https://bugs.ruby-lang.org/issues/14438

This is a backport of the following two commits from Ruby upstream:

test_time_tz.rb: past Japanese DST tzdata fix

* test/ruby/test_time_tz.rb (TestTimeTZ#test_asia_tokyo): follow
  the tzdata 2018 fix of Japanese DST transitions (1948-1951).
  [ruby-core:85373] [Bug #14438]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62506 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test_time_tz.rb: past Japanese DST tzdata fix

* test/ruby/test_time_tz.rb (TestTimeTZ#test_asia_tokyo): fix
  the expected data at the end of DST.  [Bug #14438]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@62508 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

Gbp-Pq: Name 0005-Fix-tests-to-cope-with-updates-in-tzdata.patch

Make gemspecs reproducible

With an explicit date, they will get the current date and make build
unreproducible

Gbp-Pq: Name 0004-Make-gemspecs-reproducible.patch

Mark Gemspec-reproducible change fixing #784225, too

I think the UTC date change will fix the Multi-Arch not-same file issue,
too.

Signed-off-by: Antonio Terceiro <terceiro@debian.org>
Signed-off-by: Christian Hofstaedtler <zeha@debian.org>
Gbp-Pq: Name 0003-Mark-Gemspec-reproducible-change-fixing-784225-too.patch

lib/mkmf.rb: sort list of object files in generated Makefile

Without sorting the list explicitely, its order is indeterministic,
because readdir() is also not deterministic.
When the list of object files varies between builds, they are linked
in a different order, which results in an unreproducible build.

Signed-off-by: Antonio Terceiro <terceiro@debian.org>
Signed-off-by: Reiner Herrmann <reiner@reiner-h.de>
Gbp-Pq: Name 0002-lib-mkmf.rb-sort-list-of-object-files-in-generated-M.patch

rdoc: build reproducible documentation

- sort input filenames
- provide a fixed timestamp to the gzip compression

Signed-off-by: Antonio Terceiro <terceiro@debian.org>
Signed-off-by: Christian Hofstaedtler <zeha@debian.org>
Gbp-Pq: Name 0001-rdoc-build-reproducible-documentation.patch

ruby2.5 (2.5.0-6) unstable; urgency=medium

  * debian/rules: explicitly pass --runstatedir, --localstatedir, and
    --sysconfdir to ./configure

[dgit import unpatched ruby2.5 2.5.0-6]

Import ruby2.5_2.5.0-6.debian.tar.xz

[dgit import tarball ruby2.5 2.5.0-6 ruby2.5_2.5.0-6.debian.tar.xz]

Import ruby2.5_2.5.0.orig.tar.gz

[dgit import orig ruby2.5_2.5.0.orig.tar.gz]