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/text/wdiff/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchurl, texinfo, which }:
+
+stdenv.mkDerivation rec {
+  pname = "wdiff";
+  version = "1.2.2";
+
+  src = fetchurl {
+    url = "mirror://gnu/wdiff/${pname}-${version}.tar.gz";
+    sha256 = "0sxgg0ms5lhi4aqqvz1rj4s77yi9wymfm3l3gbjfd1qchy66kzrl";
+  };
+
+  # for makeinfo
+  nativeBuildInputs = [ texinfo ];
+
+  buildInputs = [ texinfo ];
+
+  checkInputs = [ which ];
+
+  strictDeps = true;
+
+  meta = with lib; {
+    homepage = "https://www.gnu.org/software/wdiff/";
+    description = "Comparing files on a word by word basis";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ eelco SuperSandro2000 ];
+    platforms = platforms.unix;
+  };
+}