include/wctype.h: remove duplicated prototype, iswctype
It has two prototypes of iswctype.
@@ -122,7 +122,6 @@ int towctrans(wint_t, wctrans_t);
wint_t towlower(wint_t);
wint_t towupper(wint_t);
wctrans_t wctrans(FAR const char *);
-int iswctype(wint_t, wctype_t);
wctype_t wctype(FAR const char *);
#endif /* INCLUDE_WTYPE_H */
