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/ptest/default.nix

@@ -0,0 +1,23 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+}:
+
+buildPythonPackage rec {
+  pname = "ptest";
+  version =  "1.7.4";
+
+  src = fetchFromGitHub {
+    owner = "KarlGong";
+    repo = pname;
+    rev = version + "-release";
+    sha256 = "0v1zpfjagjlvdmgv6d502nmb7s996wadvpzg93i651s64rrlwq4s";
+  };
+
+  meta = with lib; {
+    description = "Test classes and test cases using decorators, execute test cases by command line, and get clear reports";
+    homepage = "https://pypi.python.org/pypi/ptest";
+    license = licenses.asl20;
+  };
+
+}