added a note clarifying post_type() recursion

some ancient pre-K&R C allows a function to return an array
and the array brackets to be put after the arguments, such
that "int c()[]" means the same as "int[] c()"
see:
http://llvm.org/bugs/show_bug.cgi?id=2399
http://java.sun.com/docs/books/jls/third_edition/html/classes.html#38703

tccgen.c

@@ -3111,6 +3111,9 @@ static void post_type(CType *type, AttributeDef *ad)
         /* NOTE: const is ignored in returned type as it has a special
            meaning in gcc / C++ */
         type->t &= ~(VT_STORAGE | VT_CONSTANT); 
+        /* some ancient pre-K&R C allows a function to return an array
+           and the array brackets to be put after the arguments, such 
+           that "int c()[]" means the same as "int[] c()" */
         post_type(type, ad);
         /* we push a anonymous symbol which will contain the function prototype */
         ad->func_args = arg_size;