[gnome-sdk-images] Speculative attempt to fix at-spi2-core build

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 45e80d7c1d7aec420d6b9d4d985a60d2c6ed893b
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Wed May 30 17:26:49 2018 -0500

    Speculative attempt to fix at-spi2-core build

 org.gnome.Sdk.json.in | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/org.gnome.Sdk.json.in b/org.gnome.Sdk.json.in
index 37383bb..57beb1e 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -340,6 +340,7 @@
         },
         {
             "name": "at-spi2-core",
+            "config-opts": [ "--disable-gtk-doc" ],
             "sources": [
                 {
                     "type": "archive",