feat: add beignet package to extra graphics packages

nixos/hardware/graphics/intel.nix

@@ -25,6 +25,7 @@ in
   hardware.graphics.extraPackages = [
     wayland-intel-vaapi-driver
     pkgs.libvdpau-va-gl
+    pkgs.beignet
   ];
 
   hardware.graphics.extraPackages32 = [
@@ -37,4 +38,4 @@ in
   environment.variables = {
     LIBVA_DRIVER_NAME = "i965";
   };
-}
+}