zic: restore missing diagnostic with 'zic -v'

* zic.c (outzone): Restore diagnostic that was inadvertently
suppressed by the 2013-09-08 change to the 400-years-hack.
This doesn't affect zic's binary output; it affects only the
diagnostics generated by 'zic -v'.  The problem evinced itself
with Asia/Tehran, which currently should generate a diagnostic,
but doesn't without this patch.
* NEWS: Document the above.
Release tzcode2013g and tzdata2013g.

* NEWS, Makefile (VERSION): Increase to 2013g.