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/ecdsa/default.nix

@@ -0,0 +1,27 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pkgs
+, six
+}:
+
+buildPythonPackage rec {
+  pname = "ecdsa";
+  version = "0.17.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "b9f500bb439e4153d0330610f5d26baaf18d17b8ced1bc54410d189385ea68aa";
+  };
+
+  propagatedBuildInputs = [ six ];
+  # Only needed for tests
+  checkInputs = [ pkgs.openssl ];
+
+  meta = with lib; {
+    description = "ECDSA cryptographic signature library";
+    homepage = "https://github.com/warner/python-ecdsa";
+    license = licenses.mit;
+  };
+
+}