[gnome-sdk-images/gnome-3-28] Add librsvg to the runtime

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 0ad9dbd89d7959b2eb02cce08b1d78d97833f9d2
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Mon Jul 23 21:36:23 2018 -0500

    Add librsvg to the runtime
    
    The freedesktop SDK builds it without vala bindings, which is not good
    enough for us.

 org.gnome.Sdk.json.in | 12 ++++++++++++
 1 file changed, 12 insertions(+)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index e011e4c..f900e4d 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -293,6 +293,18 @@
                 }
             ]
         },
+        {
+            "name": "librsvg",
+            "config-opts": ["--disable-static", "--enable-vala"],
+            "ensure-writable": ["/lib/*/gdk-pixbuf-2.0/*/loaders.cache"],
+            "sources": [
+                {
+                    "type": "archive",
+                    "url": "https://download.gnome.org/sources/librsvg/2.40/librsvg-2.40.20.tar.xz";,
+                    "sha256": "cff4dd3c3b78bfe99d8fcfad3b8ba1eee3289a0823c0e118d78106be6b84c92b"
+                }
+            ]
+        },
         {
             "name": "gtk2",
             "config-opts": ["--disable-man",