Upgrade to tzdata2013g.

From the release notes:

  Changes affecting current and near-future time stamps

    Morocco now observes DST from the last Sunday in March to the last
    Sunday in October, not April to September respectively.  (Thanks
    to Steffen Thorsen.)

(cherry picked from commit 40f07219)

Change-Id: I247f8cf4ef32ec5d6e6fe3845f9a8977b7e748b9