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/tools/X11/skippy-xd/default.nix

@@ -0,0 +1,46 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, xorgproto
+, libX11
+, libXft
+, libXcomposite
+, libXdamage
+, libXext
+, libXinerama
+, libjpeg
+, giflib
+, pkg-config
+}:
+stdenv.mkDerivation rec {
+  pname = "skippy-xd";
+  version = "unstable-2015-03-01";
+  src = fetchFromGitHub {
+    owner = "richardgv";
+    repo = "skippy-xd";
+    rev = "397216ca67074c71314f5e9a6e3f1710ccabc29e";
+    sha256 = "sha256-iP6g3iS1aPPkauBLHbgZH/l+TXbWyIJ2TmbrSiNTkn0=";
+  };
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [
+    xorgproto
+    libX11
+    libXft
+    libXcomposite
+    libXdamage
+    libXext
+    libXinerama
+    libjpeg
+    giflib
+  ];
+  makeFlags = [ "PREFIX=$(out)" ];
+  preInstall = ''
+    sed -e "s@/etc/xdg@$out&@" -i Makefile
+  '';
+  meta = with lib; {
+    description = "Expose-style compositing-based standalone window switcher";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ raskin ];
+    platforms = platforms.linux;
+  };
+}