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

@@ -358,10 +358,10 @@
 
         if (rp) {
                 /* 
                  * if found,  print starting with the space after the ':'
                  */
-                colon = (wchar_t *) wschr(rp->oldline, (int) colon_char);
+                colon = (wchar_t *) wcschr(rp->oldline, (int) colon_char);
                 (void) printf("%s", colon + 1);
         }
 }