[tz] zdump no longer reports gmtoff

[Robert Elz]

    Date:        Thu, 31 Jan 2013 06:36:22 +0700
    From:        Robert Elz <kre at munnari.oz.au>
    Message-ID:  <6086.1359588982 at eos.noi.kre.to>

  | If you got the binary as part of some system or other, then you need to
  | ask the system builders why they chose to exclude it.

It turns out that the most likely cause of this, is that zdump.c
does not #include "private.h", and that (at least on some systems)
private.h is where the relevant #defines tend to be placed (rather than
in CFLAGS in the Makefile).

Paul (or Arthur) - any reason you can think of that zdump.c should not
include private.h?

kre