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/unoconv/default.nix

@@ -0,0 +1,40 @@
+{ lib, stdenv, fetchFromGitHub, python3, libreoffice-unwrapped, asciidoc, makeWrapper
+# whether to install odt2pdf/odt2doc/... symlinks to unoconv
+, installSymlinks ? true
+}:
+
+# IMPORTANT: unoconv must use the same python version as libreoffice (unless it
+# will not be able to load the pyuno module from libreoffice).
+
+stdenv.mkDerivation rec {
+  pname = "unoconv";
+  version = "0.9.0";
+
+  src = fetchFromGitHub {
+    owner = "unoconv";
+    repo = "unoconv";
+    rev = version;
+    sha256 = "1akx64686in8j8arl6vsgp2n3bv770q48pfv283c6fz6wf9p8fvr";
+  };
+
+  nativeBuildInputs = [ asciidoc makeWrapper ];
+
+  preBuild = ''
+    makeFlags=prefix="$out"
+  '';
+
+  postInstall = ''
+    sed -i "s|/usr/bin/env python.*|${python3}/bin/${python3.executable}|" "$out/bin/unoconv"
+    wrapProgram "$out/bin/unoconv" --set UNO_PATH "${libreoffice-unwrapped}/lib/libreoffice/program/"
+  '' + (if installSymlinks then ''
+    make install-links prefix="$out"
+  '' else "");
+
+  meta = with lib; {
+    description = "Convert between any document format supported by LibreOffice/OpenOffice";
+    homepage = "http://dag.wieers.com/home-made/unoconv/";
+    license = licenses.gpl2;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.bjornfor ];
+  };
+}