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/games/xcowsay/default.nix

@@ -0,0 +1,39 @@
+{ lib, stdenv, fetchurl, makeWrapper, pkg-config
+, dbus, dbus-glib, gtk3, gdk-pixbuf, librsvg
+, fortune
+}:
+
+stdenv.mkDerivation rec {
+  pname = "xcowsay";
+  version = "1.6";
+
+  src = fetchurl {
+    url = "http://www.nickg.me.uk/files/xcowsay-${version}.tar.gz";
+    sha256 = "sha256-RqzoZP8o0tIfS3BY8CleGNAEGhIMEHipUfpDxOD1yMU=";
+  };
+
+  buildInputs = [
+    dbus
+    dbus-glib
+    gtk3
+    gdk-pixbuf # loading cow images
+    librsvg # dreaming SVG images
+  ];
+  nativeBuildInputs = [ makeWrapper pkg-config ];
+
+  configureFlags = [ "--enable-dbus" ];
+
+  postInstall = ''
+    for tool in xcowdream xcowsay xcowthink xcowfortune; do
+      wrapProgram $out/bin/$tool \
+        --prefix PATH : $out/bin:${fortune}/bin
+    done
+  '';
+
+  meta = with lib; {
+    homepage = "http://www.doof.me.uk/xcowsay";
+    description = "Tool to display a cute cow and messages";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ das_j ];
+  };
+}