xwayland: Add support for the X Security extension

Enabling the security extension is needed to properly run  xauth on wayland.
For example `ssh -X` is not going to work properly without this.

pkgs/servers/x11/xorg/xwayland.nix

@@ -96,6 +96,7 @@ stdenv.mkDerivation rec {
   ];
   mesonFlags = [
     (lib.mesonBool "xwayland_eglstream" true)
+    (lib.mesonBool "xcsecurity" true)
     (lib.mesonOption "default_font_path" defaultFontPath)
     (lib.mesonOption "xkb_bin_dir" "${xkbcomp}/bin")
     (lib.mesonOption "xkb_dir" "${xkeyboard_config}/etc/X11/xkb")