handy.h: Don't use char class if no LC_CTYPE

It is possible to compile perl to not pay attention to LC_CTYPE.  This
was testing for no locales at all; whereas the stricter requirement
should be used.

handy.h

@@ -763,7 +763,7 @@ based on the underlying C library functions):
  * macros that contain _LC in their names
  */
 
-#ifdef USE_LOCALE
+#ifdef USE_LOCALE_CTYPE
 #  ifndef CTYPE256
 #    define CTYPE256
 #  endif