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/audio/dir2opus/default.nix

@@ -0,0 +1,36 @@
+{ lib, stdenv, fetchFromGitHub, python, mutagen, wrapPython, opusTools, mpg123 }:
+
+let version = "0.12.2"; in
+stdenv.mkDerivation rec {
+  pname = "dir2opus";
+  inherit version;
+
+  pythonPath = [ mutagen ];
+  buildInputs = [ wrapPython ];
+  propagatedBuildInputs = [ opusTools mpg123 ];
+
+  src = fetchFromGitHub {
+    owner = "ehmry";
+    repo = "dir2opus";
+    rev = version;
+    hash = "sha256-ZEsXwqxikWxFOz99wTI3rEK/rEYA+BSWGrCwW4q+FFc=";
+  };
+
+  postPatch = "sed -i -e 's|#!/usr/bin/python|#!${python}/bin/python|' dir2opus";
+
+  installPhase =
+    ''
+      mkdir -p $out/bin $out/share/man/man1
+      cp dir2opus $out/bin
+      cp dir2opus.1 $out/share/man/man1
+    '';
+
+  postFixup = "wrapPythonPrograms";
+
+  meta = with lib; {
+    homepage = "https://github.com/ehmry/dir2opus";
+    maintainers = [ maintainers.ehmry ];
+    license = licenses.gpl2;
+    platforms = platforms.unix;
+  };
+}