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/skein/skeinjar.nix

@@ -0,0 +1,20 @@
+{ fetchPypi, unzip, stdenv, pname, version, jarHash }:
+
+stdenv.mkDerivation rec {
+  inherit pname version;
+
+  src = fetchPypi {
+    inherit pname version;
+    format = "wheel";
+    hash = jarHash;
+  };
+
+  dontUnpack = true;
+
+  nativeBuildInputs = [ unzip ];
+
+  installPhase = ''
+    unzip ${src}
+    mv ./skein/java/skein.jar $out
+  '';
+}