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/pywal/default.nix

@@ -0,0 +1,41 @@
+{ lib, buildPythonPackage, fetchPypi, imagemagick, feh, isPy3k }:
+
+buildPythonPackage rec {
+  pname = "pywal";
+  version = "3.3.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1drha9kshidw908k7h3gd9ws2bl64ms7bjcsa83pwb3hqa9bkspg";
+  };
+
+  patches = [
+    ./convert.patch
+    ./feh.patch
+  ];
+
+  postPatch = ''
+    substituteInPlace pywal/backends/wal.py --subst-var-by convert "${imagemagick}/bin/convert"
+    substituteInPlace pywal/wallpaper.py --subst-var-by feh "${feh}/bin/feh"
+  '';
+
+  # Invalid syntax
+  disabled = !isPy3k;
+
+  preCheck = ''
+    mkdir tmp
+    HOME=$PWD/tmp
+
+    for f in tests/test_export.py tests/test_util.py ; do
+      substituteInPlace "$f" \
+        --replace '/tmp/' "$TMPDIR/"
+    done
+  '';
+
+  meta = with lib; {
+    description = "Generate and change colorschemes on the fly. A 'wal' rewrite in Python 3";
+    homepage = "https://github.com/dylanaraps/pywal";
+    license = licenses.mit;
+    maintainers = with maintainers; [ Fresheyeball ];
+  };
+}