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/development/misc/yelp-tools/default.nix

@@ -0,0 +1,62 @@
+{ lib
+, stdenv
+, fetchurl
+, libxml2
+, libxslt
+, itstool
+, gnome
+, pkg-config
+, meson
+, ninja
+, python3
+}:
+
+python3.pkgs.buildPythonApplication rec {
+  pname = "yelp-tools";
+  version = "42.0";
+
+  format = "other";
+
+  src = fetchurl {
+    url = "mirror://gnome/sources/yelp-tools/${lib.versions.major version}/${pname}-${version}.tar.xz";
+    sha256 = "LNQwY/+nJi3xXdjTeao+o5mdQmYfB1Y/SALaoRSfffQ=";
+  };
+
+  nativeBuildInputs = [
+    pkg-config
+    meson
+    ninja
+  ];
+
+  propagatedBuildInputs = [
+    libxml2 # xmllint required by yelp-check.
+    libxslt # xsltproc required by yelp-build and yelp-check.
+  ];
+
+  buildInputs = [
+    itstool # build script checks for its presence but I am not sure if anything uses it
+    gnome.yelp-xsl
+  ];
+
+  pythonPath = [
+    python3.pkgs.lxml
+  ];
+
+  strictDeps = false; # TODO: Meson cannot find xmllint oherwise. Maybe add it to machine file?
+
+  doCheck = true;
+
+  passthru = {
+    updateScript = gnome.updateScript {
+      packageName = pname;
+    };
+  };
+
+  meta = with lib; {
+    homepage = "https://wiki.gnome.org/Apps/Yelp/Tools";
+    description = "Small programs that help you create, edit, manage, and publish your Mallard or DocBook documentation";
+    maintainers = teams.gnome.members ++ (with maintainers; [ domenkozar ]);
+    license = licenses.gpl2Plus;
+    platforms = platforms.unix;
+  };
+}