Update tzdata to 2016i.

Note: because of what appears to be a missing MFC to stable branches,
these patches were generated by doing:

% rsync -av stable/9/contrib/tzdata releng/9.3/contrib/tzdata
% svn add releng/9.3/contrib/tzdata

Errata Notice: EN-16:19
Submitted by: gjb
Approved by: so