tzcode standard C patch

[Olson, Arthur David (NCI)]

	...You shouldn't need that patch; all you
> should need to do is to compile with -DHAVE_STRERROR=1.  That being
> said, I think HAVE_STRERROR should default to 1 these days; strerror
> has been in the C standard for more than a decade and I no longer have
> access to any hosts that lack strerror.
> 
> Here's a proposed patch...
> 
Another approach would be to just drop the two pieces of code that are
conditioned on HAVE_STRERROR from zic.c.

				--ado