[libdazzle] graphing: fix availability macro

[Christian Hergert <chergert src gnome org>]

commit 2d00aad619a1676e5b58d33b1cfdb48e6687be2e
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jul 17 19:02:42 2018 -0700

    graphing: fix availability macro

 src/graphing/dzl-cpu-graph.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/graphing/dzl-cpu-graph.h b/src/graphing/dzl-cpu-graph.h
index 4ddfb0e..28cd9cb 100644
--- a/src/graphing/dzl-cpu-graph.h
+++ b/src/graphing/dzl-cpu-graph.h
@@ -30,7 +30,7 @@ G_BEGIN_DECLS
 DZL_AVAILABLE_IN_ALL
 G_DECLARE_FINAL_TYPE (DzlCpuGraph, dzl_cpu_graph, DZL, CPU_GRAPH, DzlGraphView)
 
-DZL_AVAILABLE_IN_ALL
+DZL_AVAILABLE_IN_3_30
 GtkWidget *dzl_cpu_graph_new_full (gint64 timespan,
                                    guint  max_samples);