Upgrade to tzdata2014c.

From the release notes:

  Changes affecting near-future time stamps

    Egypt observes DST starting 2014-05-15 at 24:00.
    (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
    Details have not been announced, except that DST will not be
    observed during Ramadan.  Guess that DST will stop during the same
    Ramadan dates as Morocco, and that Egypt's future spring and fall
    transitions will be the same as 2010 when it last observed DST,
    namely April's last Friday at 00:00 to September's last Thursday at
    23:00 standard time.  Also, guess that Ramadan transitions will be
    at 00:00 standard time.

Change-Id: I6a20cae02a314871acbd52cb90fcbebd37625810
(cherry picked from commit 121cb5f4a7073a2994089fd775e86b8a391e009c)