[gnome-sdk-images] Add opus

[Adrien Plazas <aplazas src gnome org>]

commit 0ffe6a5b801dfd401f9f621f68a29e71450308a9
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Tue May 23 11:27:22 2017 +0200

    Add opus
    
    This is needed for libgstopus.so to be built in gstreamer-plugins-base.

 org.gnome.Sdk.json.in |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 6058a73..3be3040 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -423,6 +423,15 @@
             ]
         },
         {
+            "name": "opus",
+            "sources": [
+                {
+                    "type": "git",
+                    "url": "https://git.xiph.org/opus.git";
+                }
+            ]
+        },
+        {
             "name": "gstreamer-plugins-base",
             "config-opts": ["--enable-experimental", "--enable-orc" ],
             "sources": [