Without this, anybody trying to use ATK_VERSION_MAX_ALLOWED will fail to
import atk.h.
#ifdef ATK_DISABLE_DEPRECATION_WARNINGS
#define ATK_DEPRECATED _ATK_EXTERN
#define ATK_DEPRECATED_FOR(f) _ATK_EXTERN
+#define ATK_UNAVAILABLE(maj,min) _ATK_EXTERN
#else
#define ATK_DEPRECATED G_DEPRECATED _ATK_EXTERN
#define ATK_DEPRECATED_FOR(f) G_DEPRECATED_FOR(f) _ATK_EXTERN
+#define ATK_UNAVAILABLE(maj,min) G_UNAVAILABLE(maj,min) _ATK_EXTERN
#endif
#define ATK_AVAILABLE_IN_ALL _ATK_EXTERN