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/dynamic-colors/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  pname = "dynamic-colors";
+  version = "0.2.2.2";
+
+  src = fetchFromGitHub {
+    owner  = "peterhoeg";
+    repo   = "dynamic-colors";
+    rev    = "v${version}";
+    sha256 = "0i63570z9aqbxa8ixh4ayb3akgjdnlqyl2sbf9d7x8f1pxhk5kd5";
+  };
+
+  PREFIX = placeholder "out";
+
+  postPatch = ''
+    substituteInPlace bin/dynamic-colors \
+      --replace /usr/share/dynamic-colors $out/share/dynamic-colors
+  '';
+
+  meta = with lib; {
+    description = "Change terminal colors on the fly";
+    homepage    = "https://github.com/peterhoeg/dynamic-colors";
+    license     = licenses.mit;
+    maintainers = with maintainers; [ peterhoeg ];
+    platforms   = platforms.unix;
+  };
+}