HAVE_TIMEZONE and cygwin

[Tom Tromey]

>>>>> "David" == Billinghurst, David (CRTS) <David.Billinghurst@riotinto.com> writes:

David> Here is an untested patch for configure.in (trunk).  I have
David> autoconf version problems, so this will have to do at present.
David> The code fragments do the right thing.

Thanks.  I'm testing this on my Linux box (not that great, but at
least we'll know it doesn't hurt other platforms).  It does look ok.

I needed to update acconfig.h too.

If it all works out I'll check it in.

Tom