[gnome-sdk-images] Ensure the json-glib locales can be installed

[Mathieu Bridon <mbridon src gnome org>]

commit 5afbc15cd8b84377ca160eaa53a109591f284741
Author: Mathieu Bridon <bochecha daitauha fr>
Date:   Mon Mar 20 12:02:18 2017 +0100

    Ensure the json-glib locales can be installed
    
    Meson fails without this, because an older json-glib is already part of
    the Freedesktop SDK.

 org.gnome.Sdk.json.in |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 40c6cd2..23a2869 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -225,6 +225,10 @@
         {
             "name": "json-glib",
             "config-opts": [ "--disable-static" ],
+            "ensure-writable": [
+                "/share/locale/*/LC_MESSAGES/json-glib-1.0.mo",
+                "/share/runtime/locale/*/share/*/LC_MESSAGES/json-glib-*.mo"
+            ],
             "sources": [
                 {
                     "type": "git",