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/security/tcpcrypt/default.nix

@@ -0,0 +1,35 @@
+{ lib, stdenv, fetchFromGitHub, autoreconfHook
+, openssl
+, libcap, libpcap, libnfnetlink, libnetfilter_conntrack, libnetfilter_queue
+}:
+
+with lib;
+
+stdenv.mkDerivation rec {
+  pname = "tcpcrypt";
+  version = "0.5";
+
+  src = fetchFromGitHub {
+    repo = "tcpcrypt";
+    owner = "scslab";
+    rev = "v${version}";
+    sha256 = "0a015rlyvagz714pgwr85f8gjq1fkc0il7d7l39qcgxrsp15b96w";
+  };
+
+  postUnpack = "mkdir -vp $sourceRoot/m4";
+
+  outputs = [ "bin" "dev" "out" ];
+  nativeBuildInputs = [ autoreconfHook ];
+  buildInputs = [ openssl libpcap ]
+    ++ optionals stdenv.isLinux [ libcap libnfnetlink libnetfilter_conntrack libnetfilter_queue ];
+
+  enableParallelBuilding = true;
+
+  meta = {
+    broken = stdenv.isDarwin;
+    homepage = "http://tcpcrypt.org/";
+    description = "Fast TCP encryption";
+    platforms = platforms.all;
+    license = licenses.bsd2;
+  };
+}