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/pgpy/default.nix

@@ -0,0 +1,39 @@
+{ lib, pythonOlder, fetchFromGitHub, buildPythonPackage
+, six, enum34, pyasn1, cryptography
+, pytestCheckHook }:
+
+buildPythonPackage rec {
+  pname = "pgpy";
+  version = "0.5.4";
+
+  src = fetchFromGitHub {
+    owner = "SecurityInnovation";
+    repo = "PGPy";
+    rev = "v${version}";
+    sha256 = "03pch39y3hi4ici6y6lvz0j0zram8dw2wvnmq1zyjy3vyvm1ms4a";
+  };
+
+  propagatedBuildInputs = [
+    six
+    pyasn1
+    cryptography
+  ] ++ lib.optionals (pythonOlder "3.4") [
+    enum34
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/SecurityInnovation/PGPy";
+    description = "Pretty Good Privacy for Python 2 and 3";
+    longDescription = ''
+      PGPy is a Python (2 and 3) library for implementing Pretty Good Privacy
+      into Python programs, conforming to the OpenPGP specification per RFC
+      4880.
+    '';
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ eadwu dotlambda ];
+  };
+}