FreeBSD 4.X has an emtpy wctype.h, so test one of the affected
functions in Unicode.hsc if it's really there.
-- -----------------------------------------------------------------------------
-- Win32 implementation
-#if defined(HAVE_WCTYPE_H) || mingw32_TARGET_OS
+#if (defined(HAVE_WCTYPE_H) && HAVE_ISWSPACE) || mingw32_TARGET_OS
-- Use the wide-char classification functions if available. Glibc
-- seems to implement these properly, even for chars > 0xffff, as long