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/stups-zign/default.nix

@@ -0,0 +1,52 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, fetchpatch
+, stups-tokens
+, stups-cli-support
+, pytest
+, pytest-cov
+, isPy3k
+}:
+
+buildPythonPackage rec {
+  pname = "stups-zign";
+  version = "1.2";
+  disabled = !isPy3k;
+
+  src = fetchFromGitHub {
+    owner = "zalando-stups";
+    repo = "zign";
+    rev = version;
+    sha256 = "1vk6pnprnd5lfx96hc2c1n7kwh99f260r730x4y2h7lamlv82fh4";
+  };
+
+  patches = [
+    # pytest 5 is currently unsupported. Fetch and apply a pr that resolves this.
+    (fetchpatch {
+      url = "https://github.com/zalando-stups/zign/commit/50140720211e547b0e59f7ddb39a732f0cc73ad7.patch";
+      sha256 = "1zmyvg1z1asaqqsmxvsx0srvxd6gkgavppvg3dblxwhkml01awqk";
+    })
+  ];
+
+  propagatedBuildInputs = [
+    stups-tokens
+    stups-cli-support
+  ];
+
+  preCheck = "
+    export HOME=$TEMPDIR
+  ";
+
+  checkInputs = [
+    pytest
+    pytest-cov
+  ];
+
+  meta = with lib; {
+    description = "OAuth2 token management command line utility.";
+    homepage = "https://github.com/zalando-stups/zign";
+    license = licenses.asl20;
+    maintainers = [ maintainers.mschuwalow ];
+  };
+}