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/archivers/unp/default.nix

@@ -0,0 +1,44 @@
+{ stdenv, lib, fetchurl, makeWrapper, perl
+, unzip, gzip, file
+# extractors which are added to unp’s PATH
+, extraBackends ? []
+}:
+
+let
+  runtime_bins =  [ file unzip gzip ] ++ extraBackends;
+
+in stdenv.mkDerivation {
+  pname = "unp";
+  version = "2.0-pre9";
+  nativeBuildInputs = [ makeWrapper ];
+  buildInputs = [ perl ];
+
+  src = fetchurl {
+    url = "mirror://debian/pool/main/u/unp/unp_2.0~pre9.tar.xz";
+    sha256 = "1lp5vi9x1qi3b21nzv0yqqacj6p74qkl5zryzwq30rjkyvahjya1";
+    name = "unp_2.0_pre9.tar.xz";
+  };
+
+  dontConfigure = true;
+  buildPhase = "true";
+  installPhase = ''
+  mkdir -p $out/bin
+  mkdir -p $out/share/man/man1
+  install ./unp $out/bin/unp
+  install ./ucat $out/bin/ucat
+  cp debian/unp.1 $out/share/man/man1
+
+  wrapProgram $out/bin/unp \
+    --prefix PATH : ${lib.makeBinPath runtime_bins}
+  wrapProgram $out/bin/ucat \
+    --prefix PATH : ${lib.makeBinPath runtime_bins}
+  '';
+
+  meta = with lib; {
+    description = "Command line tool for unpacking archives easily";
+    homepage = "https://packages.qa.debian.org/u/unp.html";
+    license = with licenses; [ gpl2 ];
+    maintainers = [ maintainers.timor ];
+    platforms = platforms.all;
+  };
+}