fix function prototype mismatch of rb_block_call

Nobu missed it in f0e73fc986.

vm_eval.c

@@ -1218,7 +1218,7 @@ iterate_method(VALUE obj)
 
 VALUE
 rb_block_call(VALUE obj, ID mid, int argc, const VALUE * argv,
-	      VALUE (*bl_proc) (ANYARGS), VALUE data2)
+	      rb_block_call_func_t bl_proc, VALUE data2)
 {
     struct iter_method_arg arg;
 
@@ -1257,7 +1257,7 @@ iterate_check_method(VALUE obj)
 
 VALUE
 rb_check_block_call(VALUE obj, ID mid, int argc, const VALUE *argv,
-		    VALUE (*bl_proc) (ANYARGS), VALUE data2)
+		    rb_block_call_func_t bl_proc, VALUE data2)
 {
     struct iter_method_arg arg;