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/development/tools/msgpack-tools/default.nix

@@ -0,0 +1,45 @@
+{ lib, stdenv, fetchurl, fetchFromGitHub, cmake }:
+
+stdenv.mkDerivation rec {
+  pname = "msgpack-tools";
+  version = "0.6";
+
+  src = fetchFromGitHub {
+    owner = "ludocode";
+    repo = "msgpack-tools";
+    rev = "v${version}";
+    sha256 = "1ygjk25zlpqjckxgqmahnz999704zy2bd9id6hp5jych1szkjgs5";
+  };
+
+  libb64 = fetchurl {
+    url = "mirror://sourceforge/libb64/libb64-1.2.1.zip";
+    sha256 = "1chlcc8qggzxnbpy5wrda533xyz38dk20w9wl4srrzawm45ny410";
+  };
+
+  rapidjson = fetchurl {
+    url = "https://github.com/miloyip/rapidjson/archive/99ba17bd66a85ec64a2f322b68c2b9c3b77a4391.tar.gz";
+    sha256 = "0jxgyy5n0lf9w36dycwwgz2wici4z9dnxlsn0z6m23zaa47g3wyw";
+  };
+
+  mpack = fetchurl {
+    url = "https://github.com/ludocode/mpack/archive/df17e83f0fa8571b9cd0d8ccf38144fa90e244d1.tar.gz";
+    sha256 = "1br8g3rf86h8z8wbqkd50aq40953862lgn0xk7cy68m07fhqc3pg";
+  };
+
+  postUnpack = ''
+    mkdir $sourceRoot/contrib
+    cp ${rapidjson} $sourceRoot/contrib/rapidjson-99ba17bd66a85ec64a2f322b68c2b9c3b77a4391.tar.gz
+    cp ${libb64} $sourceRoot/contrib/libb64-1.2.1.zip
+    cp ${mpack} $sourceRoot/contrib/mpack-df17e83f0fa8571b9cd0d8ccf38144fa90e244d1.tar.gz
+  '';
+
+  nativeBuildInputs = [ cmake ];
+
+  meta = with lib; {
+    description = "Command-line tools for converting between MessagePack and JSON";
+    homepage = "https://github.com/ludocode/msgpack-tools";
+    license = licenses.mit;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ alibabzo ];
+  };
+}