Add prototype for gc_dump_info().
diff --git a/py/gc.h b/py/gc.h
index 711212a..e5286cd 100644
--- a/py/gc.h
+++ b/py/gc.h
@@ -18,3 +18,4 @@
 } gc_info_t;
 
 void gc_info(gc_info_t *info);
+void gc_dump_info(void);