```cmake
/* taglib_config.h. Generated by cmake from taglib_config.h.cmake */

#define   TAGLIB_WITH_ASF 1
#define   TAGLIB_WITH_MP4 1
```

Add a comment about unused constants.
user
```cmake
/* taglib_config.h. Generated by cmake from taglib_config.h.cmake */

/* These values are no longer used. This file is present only for compatibility reasons. */

#define   TAGLIB_WITH_ASF 1
#define   TAGLIB_WITH_MP4 1
```
assistant