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/libacr38u/default.nix

@@ -0,0 +1,42 @@
+{ lib, stdenv, fetchurl, pkg-config, pcsclite , libusb-compat-0_1, IOKit }:
+
+stdenv.mkDerivation {
+  version = "1.7.11";
+  pname = "libacr38u";
+
+  src = fetchurl {
+    url = "http://http.debian.net/debian/pool/main/a/acr38/acr38_1.7.11.orig.tar.bz2";
+    sha256 = "0lxbq17y51cablx6bcd89klwnyigvkz0rsf9nps1a97ggnllyzkx";
+  };
+
+  doCheck = true;
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ pcsclite libusb-compat-0_1 ]
+    ++ lib.optional stdenv.isDarwin IOKit;
+
+  preBuild = ''
+    makeFlagsArray=(usbdropdir="$out/pcsc/drivers");
+  '';
+
+  meta = with lib; {
+    description = "ACR38U smartcard reader driver for pcsclite";
+    longDescription = ''
+      A PC/SC IFD handler implementation for the ACS ACR38U
+      smartcard readers. This driver is for the non-CCID version only.
+
+      This package is needed to communicate with the ACR38U smartcard readers through
+      the PC/SC Lite resource manager (pcscd).
+
+      It can be enabled in /etc/nixos/configuration.nix by adding:
+        services.pcscd.enable = true;
+        services.pcscd.plugins = [ libacr38u ];
+
+      The package is based on the debian package libacr38u.
+    '';
+    homepage = "https://www.acs.com.hk";
+    license = licenses.lgpl2Plus;
+    maintainers = with maintainers; [ berce ];
+    platforms = with platforms; unix;
+  };
+}