[gnome-boxes/wip/rishi/fallback-x11] flatpak: Prevent X11 access in a Wayland session with newer Flatpak

[Debarshi Ray <debarshir src gnome org>]

commit 28387eb6dee1e2fc5b08db5b7cb0597616b6802f
Author: Debarshi Ray <rishi fedoraproject org>
Date:   Thu Feb 7 17:58:37 2019 +0100

    flatpak: Prevent X11 access in a Wayland session with newer Flatpak
    
    https://gitlab.gnome.org/GNOME/gnome-boxes/merge_requests/119

 build-aux/flatpak/org.gnome.Boxes.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/build-aux/flatpak/org.gnome.Boxes.json b/build-aux/flatpak/org.gnome.Boxes.json
index 24f7dbf4..b7455552 100644
--- a/build-aux/flatpak/org.gnome.Boxes.json
+++ b/build-aux/flatpak/org.gnome.Boxes.json
@@ -8,6 +8,7 @@
     "desktop-file-name-prefix" : "(Development) ",
     "finish-args" : [
         "--share=ipc",
+        "--socket=fallback-x11",
         "--socket=x11",
         "--socket=wayland",
         "--socket=pulseaudio",