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/tools/backup/tarsnapper/default.nix

@@ -0,0 +1,49 @@
+{ lib
+, python3Packages
+, fetchFromGitHub
+, tarsnap
+}:
+
+python3Packages.buildPythonApplication rec {
+  pname = "tarsnapper";
+  version = "0.4";
+
+  src = fetchFromGitHub {
+    owner = "miracle2k";
+    repo = pname;
+    rev = version;
+    sha256 = "03db49188f4v1946c8mqqj30ah10x68hbg3a58js0syai32v12pm";
+  };
+
+  propagatedBuildInputs = with python3Packages; [
+    pyyaml
+    python-dateutil
+    pexpect
+  ];
+
+  checkInputs = with python3Packages; [
+    nose
+  ];
+
+  patches = [
+    # Remove standard module argparse from requirements
+    ./remove-argparse.patch
+  ];
+
+  makeWrapperArgs = [ "--prefix PATH : ${lib.makeBinPath [ tarsnap ]}" ];
+
+  checkPhase = ''
+    runHook preCheck
+    nosetests tests
+    runHook postCheck
+  '';
+
+  pythonImportsCheck = [ "tarsnapper" ];
+
+  meta = with lib; {
+    description = "Wrapper which expires backups using a gfs-scheme";
+    homepage = "https://github.com/miracle2k/tarsnapper";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ ];
+  };
+}