ci: add gtk-vnc to the deps

The gtk-vnc package is used by the vnc-display-test qtest
program. Technically only gvnc is needed, but since we
already pull in the gtk3 dep, it is harmless to depend
on gtk-vnc.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20240718094159.902024-2-berrange@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
diff --git a/tests/lcitool/projects/qemu.yml b/tests/lcitool/projects/qemu.yml
index 0c85784..252e871 100644
--- a/tests/lcitool/projects/qemu.yml
+++ b/tests/lcitool/projects/qemu.yml
@@ -32,6 +32,7 @@
  - glusterfs
  - gnutls
  - gtk3
+ - gtk-vnc
  - hostname
  - json-c
  - libaio