- Rebase to tzdata-2017c.
  - Northern Cyprus will revert to using EQ rules on October 29, 2017.
  - Sudan will switch from +03 to +02 on November 1, 2017.
  - Tonga will not change it's clocks on Novemeber 5, 2017 ending it's
    experiment with DST.
  - Fiji DST will end on January 14, 2018 rather than January 21, 2018.
  - Namibia - starting September 3, 2017 switches from +)1 with DST to
    +02 all year.  This change takes effect April 1, 2018.
  - Turks & Caicos changes from -04 all year to -05 with US DST starting
    on March 11, 2018.  Effective change date is November 4, 2018. 
  - tzdata now includes two text versions of the time zone data - tzdata.zi
    and leapseconds. 
  - Includes two patches to deal with build issues.