[vala/0.34] gstreamer-1.0: Cherry-pick some fixes from 0.38

[Rico Tzschichholz <ricotz src gnome org>]

commit e62b490f987bd6843722038c0abf20a0268c8ac1
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Mon Jan 29 23:06:59 2018 +0100

    gstreamer-1.0: Cherry-pick some fixes from 0.38

 vapi/gstreamer-base-1.0.vapi |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/vapi/gstreamer-base-1.0.vapi b/vapi/gstreamer-base-1.0.vapi
index e05e78b..c33aa5f 100644
--- a/vapi/gstreamer-base-1.0.vapi
+++ b/vapi/gstreamer-base-1.0.vapi
@@ -590,7 +590,7 @@ namespace Gst {
                        [NoWrapper]
                        public virtual Gst.FlowReturn alloc (uint64 offset, uint size, Gst.Buffer buf);
                        [NoWrapper]
-                       public virtual Gst.FlowReturn create (uint64 offset, uint size, Gst.Buffer buf);
+                       public virtual Gst.FlowReturn create (uint64 offset, uint size, out Gst.Buffer buf);
                        [NoWrapper]
                        public virtual bool decide_allocation (Gst.Query query);
                        [NoWrapper]
@@ -610,7 +610,7 @@ namespace Gst {
                        [NoWrapper]
                        public virtual bool get_size (uint64 size);
                        [NoWrapper]
-                       public virtual void get_times (Gst.Buffer buffer, Gst.ClockTime start, Gst.ClockTime 
end);
+                       public virtual void get_times (Gst.Buffer buffer, out Gst.ClockTime start, out 
Gst.ClockTime end);
                        public bool is_async ();
                        [NoWrapper]
                        public virtual bool is_seekable ();