[bug-gnu-libiconv] Portability fix for libiconv 1.13

[Larry Jones]

There are compile errors in lib/iconv_open2.h if neither HAVE_WCRTOMB
nor HAVE_MBRTOWC is defined because struct wchar_conv_struct doesn't
contain a state member unless one of those macros is defined but the
code in iconv_open2.h accesses it unconditionally.  I chose to fix it by
conditionalizing the access:

--- iconv_open2.h.orig  Tue Sep 16 20:26:17 2008
+++ iconv_open2.h       Sat Jun 27 16:33:07 2009
@@ -82,6 +82,8 @@
   /* Initialize additional fields. */
   if (from_wchar != to_wchar) {
     struct wchar_conv_struct * wcd = (struct wchar_conv_struct *) cd;
+#if HAVE_WCRTOMB || HAVE_MBRTOWC
     memset(&wcd->state,'\0',sizeof(mbstate_t));
+#endif
   }
   /* Done. */

-Larry Jones

Why can't I ever build character in a Miami condo or a casino somewhere?
-- Calvin