xpra: use xf86videodummy from xorg

pkgs/tools/X11/xpra/default.nix

@@ -1,4 +1,4 @@
-{ stdenv, lib, fetchurl, callPackage, substituteAll, python3, pkgconfig
+{ stdenv, lib, fetchurl, callPackage, substituteAll, python3, pkgconfig, writeText
 , xorg, gtk3, glib, pango, cairo, gdk-pixbuf, atk
 , wrapGAppsHook, xorgserver, getopt, xauth, utillinux, which
 , ffmpeg_4, x264, libvpx, libwebp, x265
@@ -11,7 +11,14 @@ with lib;
 let
   inherit (python3.pkgs) cython buildPythonApplication;
 
-  xf86videodummy = callPackage ./xf86videodummy { };
+  xf86videodummy = xorg.xf86videodummy.overrideDerivation (p: {
+    patches = [
+      ./0002-Constant-DPI.patch
+      ./0003-fix-pointer-limits.patch
+      ./0005-support-for-30-bit-depth-in-dummy-driver.patch
+    ];
+  });
+
 in buildPythonApplication rec {
   pname = "xpra";
   version = "3.0.7";

pkgs/tools/X11/xpra/xf86videodummy/default.nix

@@ -1,31 +0,0 @@
-{ stdenv, lib, fetchurl
-, xorgproto, xorgserver
-, pkgconfig }:
-
-with lib;
-
-stdenv.mkDerivation rec {
-  version = "0.3.8";
-  suffix = "1";
-  name = "xpra-xf86videodummy-${version}-${suffix}";
-  builder = ../../../../servers/x11/xorg/builder.sh;
-  src = fetchurl {
-    url = "mirror://xorg/individual/driver/xf86-video-dummy-${version}.tar.bz2";
-    sha256 = "1fcm9vwgv8wnffbvkzddk4yxrh3kc0np6w65wj8k88q7jf3bn4ip";
-  };
-  patches = [
-    ./0002-Constant-DPI.patch
-    ./0003-fix-pointer-limits.patch
-    ./0005-support-for-30-bit-depth-in-dummy-driver.patch
-  ];
-  nativeBuildInputs = [ pkgconfig ];
-  buildInputs = [ xorgproto xorgserver ];
-
-  meta = {
-    description = "Dummy driver for Xorg with xpra patches";
-    homepage = https://xpra.org/trac/wiki/Xdummy;
-    license = licenses.gpl2;
-    platforms = platforms.unix;
-    maintainers = with maintainers; [ numinit ];
-  };
-}