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/unrtf/default.nix

@@ -0,0 +1,31 @@
+{ lib, stdenv, fetchurl, autoconf, automake, libiconv }:
+
+stdenv.mkDerivation rec {
+  pname = "unrtf";
+  version = "0.21.10";
+
+  src = fetchurl {
+    url = "https://ftp.gnu.org/gnu/${pname}/${pname}-${version}.tar.gz";
+    sha256 = "1bil6z4niydz9gqm2j861dkxmqnpc8m7hvidsjbzz7x63whj17xl";
+  };
+
+  nativeBuildInputs = [ autoconf automake ];
+
+  buildInputs = [ libiconv ];
+
+  preConfigure = "./bootstrap";
+
+  outputs = [ "out" "man" ];
+
+  meta = with lib; {
+    description = "A converter from Rich Text Format to other formats";
+    longDescription = ''
+      UnRTF converts documents in Rich Text Format to other
+      formats, including HTML, LaTeX, and RTF itself.
+    '';
+    homepage = "https://www.gnu.org/software/unrtf/";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ joachifm ];
+    platforms = platforms.unix;
+  };
+}