[gnome-control-center] flatpak: Disable warning as error in gnome-online-accounts

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 9e2ec5a0bbd4e67b8c6810ad0f6cc36be710f09a
Author: RyuzakiKK <aasonykk gmail com>
Date:   Mon Jul 30 15:46:45 2018 +0200

    flatpak: Disable warning as error in gnome-online-accounts
    
    Currently gnome-online-accounts has some deprecation and cast warnings.
    So we need this build option in order to avoid treating them as errors.

 build-aux/flatpak/org.gnome.Settings.json | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/build-aux/flatpak/org.gnome.Settings.json b/build-aux/flatpak/org.gnome.Settings.json
index d2567a1a8..eb9427514 100644
--- a/build-aux/flatpak/org.gnome.Settings.json
+++ b/build-aux/flatpak/org.gnome.Settings.json
@@ -201,6 +201,9 @@
         {
             "name" : "gnome-online-accounts",
             "buildsystem" : "autotools",
+            "build-options" : {
+                "cflags" : "-Wno-error"
+            },
             "config-opts" : [
                 "--disable-telepathy",
                 "--disable-documentation"