Important porting note: partial support for wchar

[Marc Espie <espie_(_at_)_nerim_(_dot_)_net>]

OpenBSD is finally, slowly, getting internationalization support, starting
with functions dealing with wide characters.

(input/output is left for later, as is multi-byte to wchar conversion).

As a result, some (very few) programs using autoconf will mistakenly
think that, because there's a wchar.h or a wctype.h  header, they can
use the whole internationalization package.

These must (for now) be told manually that this is not true.

Adding
CONFIGURE_ENV+=ac_cv_header_wctype_h=no ac_cv_header_wchar_h=no
will most often be enough to get these to compile again, if necessary.

(this currently affects cooledit, enlightenment, and wine).