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/Wand/default.nix

@@ -0,0 +1,33 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, imagemagickBig
+}:
+
+buildPythonPackage rec {
+  pname = "Wand";
+  version = "0.6.7";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "ebc01bccc25dba68414ab55b482341f9ad2b197d7f49d5e724f339bbf63fb6db";
+  };
+
+  postPatch = ''
+    substituteInPlace wand/api.py --replace \
+      "magick_home = os.environ.get('MAGICK_HOME')" \
+      "magick_home = '${imagemagickBig}'"
+  '';
+
+  # tests not included with pypi release
+  doCheck = false;
+
+  passthru.imagemagick = imagemagickBig;
+
+  meta = with lib; {
+    description = "Ctypes-based simple MagickWand API binding for Python";
+    homepage = "http://wand-py.org/";
+    license = [ licenses.mit ];
+    maintainers = with maintainers; [ infinisil ];
+  };
+}