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/libcloud/default.nix

@@ -0,0 +1,49 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pycrypto
+, pythonOlder
+, requests
+}:
+
+buildPythonPackage rec {
+  pname = "apache-libcloud";
+  version = "3.6.0";
+  format = "setuptools";
+
+  disabled = pythonOlder "3.6";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-SjuRQQM3mOT7B4hv8mJU5jXgIqy91wg3XqxvVuMjUGw=";
+  };
+
+  propagatedBuildInputs = [
+    pycrypto
+    requests
+  ];
+
+  preConfigure = ''
+    cp libcloud/test/secrets.py-dist libcloud/test/secrets.py
+  '';
+
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "setup_requires=pytest_runner," "setup_requires=[],"
+  '';
+
+  # requires a certificates file
+  doCheck = false;
+
+  pythonImportsCheck = [
+    "libcloud"
+  ];
+
+  meta = with lib; {
+    description = "A unified interface to many cloud providers";
+    homepage = "https://libcloud.apache.org/";
+    changelog = "https://github.com/apache/libcloud/blob/v${version}/CHANGES.rst";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ ];
+  };
+}