compiler: make package exports self-contained

cmd/wcc/ww.h

@@ -609,4 +609,9 @@ void	check_file(Checker*, Node *file);
  * (eval_enum_value's leaf delegation, emit_defs's DATA-row gate). */
 int	fold_int_literal(Node*, u64*);
 
+/* Re-evaluate a checked integer constant under the declaration owner's
+ * import scope. The compiler export writer uses this to canonicalize array
+ * dimensions without serializing source-level constant dependencies. */
+int	check_eval_const(Checker*, Node*, const char *owner, u64*);
+
 #endif /* WW_H */