[gimp] build: when bumping glib, also bump glib-networking.

[Jehan Pagès <jehanp src gnome org>]

commit e875ec3fc61a924af9228193e029c76b440629bc
Author: Jehan <jehan girinstud io>
Date:   Fri Jan 5 03:57:52 2018 +0100

    build: when bumping glib, also bump glib-networking.
    
    Tested and successful flatpak build!

 build/flatpak/org.gimp.GIMP-nightly.json |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/build/flatpak/org.gimp.GIMP-nightly.json b/build/flatpak/org.gimp.GIMP-nightly.json
index 71d518c..f98029e 100644
--- a/build/flatpak/org.gimp.GIMP-nightly.json
+++ b/build/flatpak/org.gimp.GIMP-nightly.json
@@ -48,6 +48,19 @@
             ]
         },
         {
+            "name" : "glib-networking",
+            "config-opts" : [
+                "--disable-static"
+            ],
+            "sources" : [
+                {
+                    "url": 
"http://ftp.gnome.org/pub/gnome/sources/glib-networking/2.54/glib-networking-2.54.1.tar.xz";,
+                    "sha256": "eaa787b653015a0de31c928e9a17eb57b4ce23c8cf6f277afaec0d685335012f",
+                    "type": "archive"
+                }
+            ]
+        },
+        {
             "name": "mypaint-brushes",
             "sources": [
                 {