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/os-specific/linux/setools/default.nix

@@ -0,0 +1,42 @@
+{ lib, fetchFromGitHub, python3
+, libsepol, libselinux, checkpolicy
+, withGraphics ? false
+}:
+
+with lib;
+with python3.pkgs;
+
+buildPythonApplication rec {
+  pname = "setools";
+  version = "4.4.0";
+
+  src = fetchFromGitHub {
+    owner = "SELinuxProject";
+    repo = pname;
+    rev = version;
+    sha256 = "1qvd5j6zwq4fmlahg45swjplhif2z89x7s6pnp07gvcp2fbqdsh5";
+  };
+
+  nativeBuildInputs = [ cython ];
+  buildInputs = [ libsepol ];
+  propagatedBuildInputs = [ enum34 libselinux networkx ]
+    ++ optionals withGraphics [ pyqt5 ];
+
+  checkInputs = [ tox checkpolicy ];
+  preCheck = ''
+    export CHECKPOLICY=${checkpolicy}/bin/checkpolicy
+  '';
+
+  setupPyBuildFlags = [ "-i" ];
+
+  preBuild = ''
+    export SEPOL="${lib.getLib libsepol}/lib/libsepol.a"
+  '';
+
+  meta = {
+    description = "SELinux Policy Analysis Tools";
+    homepage = "https://github.com/SELinuxProject/setools";
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+  };
+}