[gnome-builder/wip/gtk4-port] build: specify GTK 4 for VTE

[Christian Hergert <chergert src gnome org>]

commit 84f19c050f4409fdf16a15c137494aad00ab08ca
Author: Christian Hergert <chergert redhat com>
Date:   Fri Sep 24 11:08:40 2021 -0700

    build: specify GTK 4 for VTE

 build-aux/flatpak/org.gnome.Builder.json | 3 +++
 1 file changed, 3 insertions(+)
---
diff --git a/build-aux/flatpak/org.gnome.Builder.json b/build-aux/flatpak/org.gnome.Builder.json
index d7fd80aa4..6100158d5 100644
--- a/build-aux/flatpak/org.gnome.Builder.json
+++ b/build-aux/flatpak/org.gnome.Builder.json
@@ -276,6 +276,9 @@
         {
             "name" : "vte",
             "buildsystem" : "meson",
+            "config-opts" : [
+                "-Dgtk4=true"
+            ],
             "sources" : [
                 {
                     "type" : "git",