Some GNU (and GNU-style) programs assume that the presence of the
restartable multibyte/wide character functions (mbsrtowcs(),
wcsrtombs()) means that all of the other ISO C90 Amd.1 wide character
functions exist. The restartable mb/wc functions were added recently
and do not exist in -stable.
Making blind assumptions like this defeats the purpose of using
autoconf at all..
Submitted by: tjr