Resolves #1507341
    - 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.