[vala/0.48] gstreamer: Update from 1.17.2+ git master

[Rico Tzschichholz <ricotz src gnome org>]

commit 8c6d8d9b87de41d1117bb743bf59f92535359a7a
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sat Aug 15 12:38:45 2020 +0200

    gstreamer: Update from 1.17.2+ git master

 vapi/gstreamer-base-1.0.vapi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/vapi/gstreamer-base-1.0.vapi b/vapi/gstreamer-base-1.0.vapi
index ba7bde292..cd6debddc 100644
--- a/vapi/gstreamer-base-1.0.vapi
+++ b/vapi/gstreamer-base-1.0.vapi
@@ -128,7 +128,7 @@ namespace Gst {
                        [NoAccessorMethod]
                        public Gst.Base.AggregatorStartTimeSelection start_time_selection { get; set; }
                        [Version (since = "1.18")]
-                       public signal void samples_selected (Gst.Segment object, uint64 p0, uint64 p1, uint64 
p2, Gst.Structure p3);
+                       public signal void samples_selected (Gst.Segment segment, uint64 pts, uint64 dts, 
uint64 duration, Gst.Structure? info);
                }
                [CCode (cheader_filename = "gst/base/base.h", cname = "GstAggregatorPad", lower_case_cprefix 
= "gst_aggregator_pad_", type_id = "gst_aggregator_pad_get_type ()")]
                [GIR (name = "AggregatorPad")]