[vala/0.36] gstreamer: Cherry-pick some fixes from 0.40

[Rico Tzschichholz <ricotz src gnome org>]

commit 789e6072483c01b07ffae77150159cc6361efece
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Sep 17 17:01:12 2018 +0200

    gstreamer: Cherry-pick some fixes from 0.40

 vapi/gstreamer-1.0.vapi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/vapi/gstreamer-1.0.vapi b/vapi/gstreamer-1.0.vapi
index 89b52c32c..4cb4e37de 100644
--- a/vapi/gstreamer-1.0.vapi
+++ b/vapi/gstreamer-1.0.vapi
@@ -2719,7 +2719,7 @@ namespace Gst {
                [Version (since = "1.2")]
                public static unowned string[] api_type_get_tags (GLib.Type api);
                public static bool api_type_has_tag (GLib.Type api, GLib.Quark tag);
-               public static GLib.Type api_type_register (string api, string tags);
+               public static GLib.Type api_type_register (string api, [CCode (array_length = false, 
array_null_terminated = true)] string[] tags);
                public static unowned Gst.MetaInfo? get_info (string impl);
                public static unowned Gst.MetaInfo? register (GLib.Type api, string impl, size_t size, [CCode 
(scope = "async")] Gst.MetaInitFunction init_func, [CCode (scope = "async")] Gst.MetaFreeFunction free_func, 
[CCode (scope = "async")] Gst.MetaTransformFunction transform_func);
        }