master bf7d66aa1a: Fix build with GTK 3.18.0 or earlier

[Po Lu]

branch: master
commit bf7d66aa1aa165bedbab33075820d25f405fcad5
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Fix build with GTK 3.18.0 or earlier
    
    * src/gtkutil.c (xg_update_scroll_bar_pos)
    (xg_update_horizontal_scrollbar_pos): Avoid
    gtk_widget_queue_allocate on older GTK versions.
---
 src/gtkutil.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/gtkutil.c b/src/gtkutil.c
index 174a1bffea..ec2864e34a 100644
--- a/src/gtkutil.c
+++ b/src/gtkutil.c
@@ -4736,7 +4736,9 @@ xg_update_scrollbar_pos (struct frame *f,
          if (wdesc)
            {
              gdk_window_move_resize (wdesc, left, top, width, height);
+#if GTK_CHECK_VERSION (3, 20, 0)
              gtk_widget_queue_allocate (wparent);
+#endif
            }
 #endif
         }
@@ -4841,7 +4843,9 @@ xg_update_horizontal_scrollbar_pos (struct frame *f,
          if (wdesc)
            {
              gdk_window_move_resize (wdesc, left, top, width, height);
+#if GTK_CHECK_VERSION (3, 20, 0)
              gtk_widget_queue_allocate (wparent);
+#endif
            }
 #endif
         }