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/misc/zthrottle/default.nix

@@ -0,0 +1,27 @@
+{ lib, stdenv, fetchFromGitHub, zsh }:
+
+stdenv.mkDerivation rec {
+  pname = "zthrottle";
+  version = "unstable-2017-7-24";
+
+  src = fetchFromGitHub {
+    owner = "anko";
+    repo = pname;
+    rev = "f62066661e49375baeb891fa8e43ad4527cbd0a0";
+    sha256 = "1ipvwmcsigzmxlg7j22cxpvdcgqckkmfpsnvzy18nbybd5ars9l5";
+  };
+
+  buildInputs = [ zsh ];
+
+  installPhase = ''
+    install -D zthrottle $out/bin/zthrottle
+  '';
+
+  meta = with lib; {
+    description = "A program that throttles a pipeline, only letting a line through at most every $1 seconds.";
+    homepage = "https://github.com/anko/zthrottle";
+    license = licenses.unlicense;
+    maintainers = [ maintainers.ckie ];
+    platforms = platforms.unix;
+  };
+}