uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/tools/text/xml/xmldiff/default.nix

@@ -0,0 +1,43 @@
+{ lib
+, buildPythonApplication
+, fetchFromGitHub
+, lxml
+, setuptools
+, six
+}:
+
+buildPythonApplication rec {
+  pname = "xmldiff";
+  version = "2.4";
+
+  src = fetchFromGitHub {
+    owner = "Shoobx";
+    repo = pname;
+    rev = version;
+    hash = "sha256-xqudHYfwOce2C0pcFzId0JDIIC6R5bllmVKsH+CvTdE=";
+  };
+
+  propagatedBuildInputs = [
+    lxml
+    setuptools
+    six
+  ];
+
+  meta = with lib; {
+    homepage = "https://xmldiff.readthedocs.io/en/stable/";
+    description = "A library and command line utility for diffing xml";
+    longDescription = ''
+      xmldiff is a library and a command-line utility for making diffs out of
+      XML. This may seem like something that doesn't need a dedicated utility,
+      but change detection in hierarchical data is very different from change
+      detection in flat data. XML type formats are also not only used for
+      computer readable data, it is also often used as a format for hierarchical
+      data that can be rendered into human readable formats. A traditional diff
+      on such a format would tell you line by line the differences, but this
+      would not be be readable by a human. xmldiff provides tools to make human
+      readable diffs in those situations.
+    '';
+    license = licenses.mit;
+    maintainers = with maintainers; [ AndersonTorres anpryl ];
+  };
+}