Updated to tzdata2019c.
Updated to tzdata2019b.
Updated to tzdata2019a.
Merge remote-tracking branch 'origin/master' into new_utf8
Updated to tzdata2018i.
Updated to tzdata2018g.
Merge remote-tracking branch 'origin/8.1' into gobject-introspection
Calendar: Revert broken tzdata change in previous commit.
Cpp: Break circular references via "magic" macros.
Updated to tzdata2018e.
Updated to tzdata2018d.
Merge branch '8.1' into peter/travis
Updated to 2018c.
Updated to 2017c.