PATCH: Fix libcpp configury/portability issue

[Zack Weinberg]

Gerald Pfeifer <gerald@pfeifer.com> writes:

>>> Definitely.  This is a complete and utter mess: two config.h files
>>> plus auto-host.h, all containing definitions of HAVE_ICONV and
>>> HAVE_ICONV_H (though not all have both and the latter even is not
>>> consistent) is a software engineering nightmare.
>> I think maybe we should do with iconv.h what we already do with
>> libintl - have the intl directory determine the answer, and everyone
>> else just defers to that.
>
> That seems like an excellent plan.  Will you be able to work on that
> for 4.0?

I'll see if I can find the time.  Could you file a PR and assign it to
me so I don't forget?

> For now, okay to commit the following patch, which is based on your
> suggestions and passed bootstrap on i386-unknown-freesbsd4.10 as well
> as i386-pc-linux-gnu?

Yes, this is OK.

zw