[gnome-builder] build: --disable-qt5 for avahi

[Christian Hergert <chergert src gnome org>]

commit ee098787c9631ce0d1be1c1a42cd750afac20e09
Author: Christian Hergert <chergert redhat com>
Date:   Thu May 3 13:29:10 2018 -0700

    build: --disable-qt5 for avahi

 build-aux/flatpak/org.gnome.Builder.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index f4be1751d..f21b932f1 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -761,6 +761,7 @@
                 "--with-distro=none",
                 "--disable-qt3",
                 "--disable-qt4",
+                "--disable-qt5",
                 "--disable-gtk",
                 "--disable-gtk3",
                 "--disable-python",