[gnome-boxes] flatpak: Disable user-mode emulation targets in QEMU

[Felipe Borges <felipeborges src gnome org>]

commit 891a880faa7016e99106f8d8553d397fb296401e
Author: Dor Askayo <dor askayo gmail com>
Date:   Fri Nov 8 15:51:17 2019 +0200

    flatpak: Disable user-mode emulation targets in QEMU
    
    They aren't required for gnome-boxes and take a lot of time to build.

 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 68210db9..2da5dfc7 100644
--- a/build-aux/flatpak/org.gnome.Boxes.json
+++ b/build-aux/flatpak/org.gnome.Boxes.json
@@ -363,6 +363,7 @@
         {
             "name" : "qemu",
             "config-opts" : [
+                "--disable-user",
                 "--enable-kvm",
                 "--enable-spice",
                 "--enable-opengl",