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/opentimestamps/default.nix

@@ -0,0 +1,40 @@
+{ lib, buildPythonPackage, fetchFromGitHub, fetchpatch, isPy3k
+, bitcoinlib, GitPython, pysha3, git }:
+
+buildPythonPackage rec {
+  pname = "opentimestamps";
+  version = "0.4.1";
+  disabled = (!isPy3k);
+
+  # We can't use the pypi source because it doesn't include README.md which is
+  # needed in setup.py
+  src = fetchFromGitHub {
+    owner = "opentimestamps";
+    repo = "python-opentimestamps";
+    rev = "python-opentimestamps-v${version}";
+    sha256 = "0c45ij8absfgwizq6dfgg81siq3y8605sgg184vazp292w8nqmqr";
+  };
+
+  patches = [
+    # build against bitcoinlib-0.11
+    (fetchpatch {
+      url = "https://patch-diff.githubusercontent.com/raw/opentimestamps/python-opentimestamps/pull/43.patch";
+      sha256 = "0bxzk4pzpqk7zrk2x7vn2bj2n3pc5whf8ijbd225s6674q450zbg";
+    })
+  ];
+
+  # Remove a failing test which expects the test source file to reside in the
+  # project's Git repo
+  postPatch = ''
+    rm opentimestamps/tests/core/test_git.py
+  '';
+
+  checkInputs = [ git ];
+  propagatedBuildInputs = [ bitcoinlib GitPython pysha3 ];
+
+  meta = {
+    description = "Create and verify OpenTimestamps proofs";
+    homepage = "https://github.com/opentimestamps/python-opentimestamps";
+    license = lib.licenses.lgpl3;
+  };
+}