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/development/python-modules/virtualenv-clone/default.nix

@@ -0,0 +1,42 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, virtualenv
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "virtualenv-clone";
+  version = "0.5.7";
+  format = "setuptools";
+
+  src = fetchFromGitHub {
+    owner = "edwardgeorge";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-qrN74IwLRqiVPxU8gVhdiM34yBmiS/5ot07uroYPDVw=";
+  };
+
+  postPatch = ''
+    substituteInPlace tests/__init__.py \
+      --replace "'virtualenv'" "'${virtualenv}/bin/virtualenv'"
+
+    substituteInPlace tests/test_virtualenv_sys.py \
+      --replace "'virtualenv'" "'${virtualenv}/bin/virtualenv'"
+  '';
+
+  propagatedBuildInputs = [
+    virtualenv
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/edwardgeorge/virtualenv-clone";
+    description = "Script to clone virtualenvs";
+    license = licenses.mit;
+    maintainers = with maintainers; [ ];
+  };
+}