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/xcwd/default.nix

@@ -0,0 +1,31 @@
+{ lib, stdenv, fetchFromGitHub, libX11 }:
+
+stdenv.mkDerivation {
+  version = "2019-05-09";
+  pname = "xcwd";
+
+  src = fetchFromGitHub {
+    owner   = "schischi";
+    repo    = "xcwd";
+    rev     = "99738e1176acf3f39c2e709236c3fd87b806f2ed";
+    sha256  = "1wvhj5x8ysi1q73f9cw1f6znvp2zivd8pp6z1p3znw732h4zlv6v";
+  };
+
+  buildInputs = [ libX11 ];
+
+  makeFlags = [ "prefix=$(out)" ];
+
+  installPhase = ''
+    install -D xcwd "$out/bin/xcwd"
+  '';
+
+  meta = with lib; {
+    description = ''
+      A simple tool which print the current working directory of the currently focused window
+    '';
+    homepage = "https://github.com/schischi/xcwd";
+    maintainers = [ maintainers.grburst ];
+    license = licenses.bsd3;
+    platforms = platforms.linux;
+  };
+}