verbiste: don't build gtk2 app

GTK2 is being removed from Nixpkgs, so we avoid building the graphical
application interface while retaining the command line.

pkgs/by-name/ve/verbiste/package.nix

@@ -3,7 +3,6 @@
   stdenv,
   fetchurl,
   pkg-config,
-  gtk2,
   libxml2,
 }:
 
@@ -18,10 +17,9 @@ stdenv.mkDerivation (finalAttrs: {
 
   nativeBuildInputs = [ pkg-config ];
 
-  buildInputs = [
-    gtk2
-    libxml2
-  ];
+  buildInputs = [ libxml2 ];
+
+  configureFlags = [ "--without-gtk-app" ];
 
   enableParallelBuilding = true;