[gnome-remote-desktop] ci: Build with VNC backend

[Jonas Ådahl <jadahl src gnome org>]

commit 90514ba07c0c490a8e75ca434c73f8741fe3fd88
Author: Jeremy Bicha <jeremy bicha canonical com>
Date:   Fri Jul 1 08:40:22 2022 -0400

    ci: Build with VNC backend
    
    We need to make sure the VNC build option still works

 .gitlab-ci.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 7fa29cc9..9c4fa713 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -80,7 +80,7 @@ build-gnome-remote-desktop:
     - .gnome-remote-desktop.fedora:35@x86_64
   stage: build
   script:
-    - meson . build -Dbuildtype=debugoptimized --werror
+    - meson . build -Dbuildtype=debugoptimized -Dvnc=true --werror
     - ninja -C build
     - ninja -C build install
   needs: