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/cxxfilt/default.nix

@@ -0,0 +1,36 @@
+{ lib
+, stdenv
+, buildPythonPackage
+, fetchPypi
+, gcc-unwrapped
+}:
+buildPythonPackage rec {
+  pname = "cxxfilt";
+  version = "0.3.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "7df6464ba5e8efbf0d8974c0b2c78b32546676f06059a83515dbdfa559b34214";
+  };
+
+  postPatch = let
+    libstdcpp = "${lib.getLib gcc-unwrapped}/lib/libstdc++${stdenv.hostPlatform.extensions.sharedLibrary}";
+  in ''
+    substituteInPlace cxxfilt/__init__.py \
+      --replace "find_any_library('stdc++', 'c++')" '"${libstdcpp}"'
+  '';
+
+  # no tests
+  doCheck = false;
+
+  pythonImportsCheck = [
+    "cxxfilt"
+  ];
+
+  meta = with lib; {
+    description = "Demangling C++ symbols in Python / interface to abi::__cxa_demangle ";
+    homepage = "https://github.com/afq984/python-cxxfilt";
+    license = licenses.bsd2;
+    maintainers = teams.determinatesystems.members;
+  };
+}