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>

doc/default.nix

@@ -0,0 +1,39 @@
+{ pkgs ? (import ./.. { }), nixpkgs ? { }}:
+let
+  lib = pkgs.lib;
+  doc-support = import ./doc-support { inherit pkgs nixpkgs; };
+in pkgs.stdenv.mkDerivation {
+  name = "nixpkgs-manual";
+
+  nativeBuildInputs = with pkgs; [
+    pandoc
+    graphviz
+    libxml2
+    libxslt
+    zip
+    jing
+    xmlformat
+  ];
+
+  src = lib.cleanSource ./.;
+
+  postPatch = ''
+    ln -s ${doc-support} ./doc-support/result
+  '';
+
+  installPhase = ''
+    dest="$out/share/doc/nixpkgs"
+    mkdir -p "$(dirname "$dest")"
+    mv out/html "$dest"
+    mv "$dest/index.html" "$dest/manual.html"
+
+    mv out/epub/manual.epub "$dest/nixpkgs-manual.epub"
+
+    mkdir -p $out/nix-support/
+    echo "doc manual $dest manual.html" >> $out/nix-support/hydra-build-products
+    echo "doc manual $dest nixpkgs-manual.epub" >> $out/nix-support/hydra-build-products
+  '';
+
+  # Environment variables
+  PANDOC_LUA_FILTERS_DIR = "${pkgs.pandoc-lua-filters}/share/pandoc/filters";
+}