[vala/staging] gobject-2.0: Add new symbols from 2.68

[Rico Tzschichholz <ricotz src gnome org>]

commit b9c2963b299e4445f0d6b43976e97abe6ae3c11e
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Jan 3 10:54:31 2021 +0100

    gobject-2.0: Add new symbols from 2.68

 vapi/gobject-2.0.vapi | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/vapi/gobject-2.0.vapi b/vapi/gobject-2.0.vapi
index 90ebbd506..56ebabe95 100644
--- a/vapi/gobject-2.0.vapi
+++ b/vapi/gobject-2.0.vapi
@@ -56,9 +56,15 @@ namespace GLib {
        [CCode (cheader_filename = "glib-object.h", type_id = "G_TYPE_BINDING")]
        [Version (since = "2.26")]
        public class Binding : GLib.Object {
+               [Version (since = "2.68")]
+               public GLib.Object? dup_source ();
+               [Version (since = "2.68")]
+               public GLib.Object? dup_target ();
                public GLib.BindingFlags get_flags ();
+               [Version (deprecated = true, deprecated_since = "2.68", replacement = "Binding.dup_source")]
                public unowned GLib.Object get_source ();
                public unowned string get_source_property ();
+               [Version (deprecated = true, deprecated_since = "2.68", replacement = "Binding.dup_target")]
                public unowned GLib.Object get_target ();
                public unowned string get_target_property ();
                [DestroysInstance]
@@ -659,6 +665,8 @@ namespace GLib {
                public void* get_qdata (GLib.Quark quark);
                [Version (since = "2.36")]
                public static uint get_type_registration_serial ();
+               [Version (since = "2.68")]
+               public GLib.Type interface_instantiatable_prerequisite ();
                [CCode (array_length_type = "guint")]
                public GLib.Type[] interface_prerequisites ();
                [CCode (array_length_type = "guint")]
@@ -863,6 +871,8 @@ namespace GLib {
                NO_HOOKS,
                MUST_COLLECT,
                DEPRECATED,
+               [Version (since = "2.68")]
+               ACCUMULATOR_FIRST_RUN,
                [CCode (cname = "G_SIGNAL_FLAGS_MASK")]
                MASK
        }