make: use the more modern wchar routines, not widec.h

@@ -75,11 +75,11 @@
 int
 get_char_semantics_entry(wchar_t ch)
 {
         wchar_t         *char_sem_char;
 
-        char_sem_char = (wchar_t *) wschr(char_semantics_char, ch);
+        char_sem_char = (wchar_t *) wcschr(char_semantics_char, ch);
         if (char_sem_char == NULL) {
                 /*
                  * Return the integer entry for the last slot,
                  * whose content is empty.
                  */