h265parse: Don't discard first AU delimiter

Apply the commit 48a1f27

https://bugzilla.gnome.org/show_bug.cgi?id=754124
diff --git a/gst/videoparsers/gsth265parse.c b/gst/videoparsers/gsth265parse.c
index 4832402..ca4a1f9 100644
--- a/gst/videoparsers/gsth265parse.c
+++ b/gst/videoparsers/gsth265parse.c
@@ -715,6 +715,12 @@
             h265parse->idr_pos);
       }
       break;
+    case GST_H265_NAL_AUD:
+      /* Just accumulate AU Delimiter, whether it's before SPS or not */
+      pres = gst_h265_parser_parse_nal (nalparser, nalu);
+      if (pres != GST_H265_PARSER_OK)
+        return FALSE;
+      break;
     default:
       /* drop anything before the initial SPS */
       if (!GST_H265_PARSE_STATE_VALID (h265parse, GST_H265_PARSE_STATE_GOT_SPS))