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/pycosat/default.nix

@@ -0,0 +1,21 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+}:
+
+buildPythonPackage rec {
+  pname = "pycosat";
+  version = "0.6.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    extension = "zip";
+    sha256 = "4c99874946a7e939bb941bbb019dd2c20e6068e3107c91366e7779c69d70e0ed";
+  };
+
+  meta = {
+    description = "Bindings to picosat SAT solver";
+    homepage = "https://github.com/ContinuumIO/pycosat";
+    license = lib.licenses.mit;
+  };
+}