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/libraries/libserialport/default.nix

@@ -0,0 +1,23 @@
+{ lib, stdenv, fetchurl, pkg-config, udev, darwin }:
+
+stdenv.mkDerivation rec {
+  pname = "libserialport";
+  version = "0.1.1";
+
+  src = fetchurl {
+    url = "https://sigrok.org/download/source/libserialport/${pname}-${version}.tar.gz";
+    sha256 = "17ajlwgvyyrap8z7f16zcs59pksvncwbmd3mzf98wj7zqgczjaja";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = lib.optional stdenv.isLinux udev
+    ++ lib.optional stdenv.isDarwin darwin.apple_sdk.frameworks.IOKit;
+
+  meta = with lib; {
+    description = "Cross-platform shared library for serial port access";
+    homepage = "https://sigrok.org/";
+    license = licenses.gpl3Plus;
+    platforms = platforms.linux ++ platforms.darwin;
+    maintainers = [ maintainers.bjornfor ];
+  };
+}