[vala/0.40] gtk+-3.0: Update to 3.24.9~18177388

[Rico Tzschichholz <ricotz src gnome org>]

commit 810cf76d4da5470d13f168cabee715a008ca9e42
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Jun 15 20:25:25 2019 +0200

    gtk+-3.0: Update to 3.24.9~18177388

 vapi/gtk+-3.0.vapi | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/vapi/gtk+-3.0.vapi b/vapi/gtk+-3.0.vapi
index 9fc210a30..24d34689e 100644
--- a/vapi/gtk+-3.0.vapi
+++ b/vapi/gtk+-3.0.vapi
@@ -6572,7 +6572,7 @@ namespace Gtk {
                public unowned Gtk.Widget get_vscrollbar ();
                [Version (since = "3.4")]
                public void set_capture_button_press (bool capture_button_press);
-               public void set_hadjustment (Gtk.Adjustment hadjustment);
+               public void set_hadjustment (Gtk.Adjustment? hadjustment);
                [Version (since = "3.4")]
                public void set_kinetic_scrolling (bool kinetic_scrolling);
                [Version (since = "3.22")]
@@ -6592,7 +6592,7 @@ namespace Gtk {
                [Version (since = "3.22")]
                public void set_propagate_natural_width (bool propagate);
                public void set_shadow_type (Gtk.ShadowType type);
-               public void set_vadjustment (Gtk.Adjustment vadjustment);
+               public void set_vadjustment (Gtk.Adjustment? vadjustment);
                [Version (since = "2.10")]
                public void unset_placement ();
                public Gtk.Adjustment hadjustment { get; set construct; }
@@ -6888,6 +6888,9 @@ namespace Gtk {
                [NoAccessorMethod]
                public string gtk_modules { owned get; set; }
                [NoAccessorMethod]
+               [Version (since = "3.24.9")]
+               public bool gtk_overlay_scrolling { get; set; }
+               [NoAccessorMethod]
                [Version (since = "3.6")]
                public bool gtk_primary_button_warps_slider { get; set; }
                [NoAccessorMethod]