[gnome-sdk-images] Pass --disable-Werror to yelp

[Michael Catanzaro <mcatanzaro src gnome org>]

commit d4e111559bcd1db10f26f6345cd68d519b1cd6d0
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Fri Jun 15 10:51:21 2018 -0500

    Pass --disable-Werror to yelp
    
    I guess we can do this on a per-module basis, since AX_COMPILER_FLAGS
    never really took off before we started getting rid of Autotools.

 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 b185121..53ea7ef 100644
--- a/org.gnome.Sdk.json.in
+++ b/org.gnome.Sdk.json.in
@@ -891,6 +891,7 @@
         },
         {
             "name": "yelp",
+            "config-opts": ["--disable-Werror"],
             "sources": [
                 {
                     "type": "git",