[libstdc++] Fix iconv testsuite problems

[Benjamin Kosnik]

>2004-03-19  Phil Edwards  <phil@codesourcery.com>
>
>	* acinclude.m4 (GLIBCXX_CHECK_WCHAR_T_SUPPORT):  Set LIBICONV,
>	not libiconv.  SUBST this variable as well.
>	* testsuite/Makefile.am (site.exp):  New target, based on that
>	created by automake.  Also set libiconv.
>
>	* configure, Makefile.in, include/Makefile.in, libmath/Makefile.in,
>	libsupc++/Makefile.in, po/Makefile.in, src/Makefile.in,
>	testsuite/Makefile.in:  Regenerate.

Whoo! I can confirm that on x86/linux the fails and unexpected behaviors
are gone. I'm now getting clean test runs again.

Thanks!

-benjamin