[vala/0.50] gstreamer: Update from 1.19.0+ git master

[Rico Tzschichholz <ricotz src gnome org>]

commit 5f1bad9f2c16d9ef6046474629d75bd22a5f8e26
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Nov 19 12:51:59 2020 +0100

    gstreamer: Update from 1.19.0+ git master

 vapi/gstreamer-video-1.0.vapi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/vapi/gstreamer-video-1.0.vapi b/vapi/gstreamer-video-1.0.vapi
index 07142f9b5..997214bfa 100644
--- a/vapi/gstreamer-video-1.0.vapi
+++ b/vapi/gstreamer-video-1.0.vapi
@@ -189,7 +189,7 @@ namespace Gst {
                        [NoWrapper]
                        public virtual bool set_format (Gst.Video.CodecState state);
                        [Version (since = "1.16.")]
-                       public Gst.Video.CodecState set_interlaced_output_state (Gst.Video.Format fmt, 
Gst.Video.InterlaceMode mode, uint width, uint height, Gst.Video.CodecState? reference);
+                       public Gst.Video.CodecState set_interlaced_output_state (Gst.Video.Format fmt, 
Gst.Video.InterlaceMode interlace_mode, uint width, uint height, Gst.Video.CodecState? reference);
                        public void set_latency (Gst.ClockTime min_latency, Gst.ClockTime max_latency);
                        public void set_max_errors (int num);
                        [Version (since = "1.4")]