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/pcb2gcode/default.nix

@@ -0,0 +1,56 @@
+{ stdenv
+, lib
+, fetchFromGitHub
+, autoreconfHook
+, pkg-config
+, boost
+, glibmm
+, gtkmm2
+, gerbv
+, librsvg
+, bash
+, fetchpatch
+}:
+
+stdenv.mkDerivation rec {
+  pname = "pcb2gcode";
+  version = "2.4.0";
+
+  src = fetchFromGitHub {
+    owner = "pcb2gcode";
+    repo = "pcb2gcode";
+    rev = "v${version}";
+    sha256 = "sha256-3VQlYtSi6yWWNuxTlBzvBtkM5hAss47xat+sEW+P79E=";
+  };
+
+  patches = [
+    # the patch below is part of upstream mainline, we can remove this
+    # when they make their next release
+    (fetchpatch {
+      url = "https://github.com/pcb2gcode/pcb2gcode/commit/01cd18a6d859ab1aac6c532c99be9109f083448d.patch";
+      sha256 = "sha256-5hl8KsDxSWMzXS3oRG0fBfHFq0IpZ//sU8lfY9Yp8L0=";
+    })
+  ];
+
+  nativeBuildInputs = [ autoreconfHook pkg-config ];
+
+  buildInputs = [ boost glibmm gtkmm2 gerbv librsvg ];
+
+  postPatch = ''
+    substituteInPlace ./Makefile.am \
+    --replace '`git describe --dirty --always --tags`' '${version}'
+  '';
+
+  meta = with lib; {
+    description = "Command-line tool for isolation, routing and drilling of PCBs ";
+    longDescription = ''
+      pcb2gcode is a command-line software for the isolation, routing and drilling of PCBs.
+      It takes Gerber files as input and it outputs gcode files, suitable for the milling of PCBs.
+      It also includes an Autoleveller, useful for the automatic dynamic calibration of the milling depth.
+    '';
+    homepage = "https://github.com/pcb2gcode/pcb2gcode";
+    license = licenses.gpl3Only;
+    maintainers = with maintainers; [ kritnich ];
+    platforms = platforms.linux;
+  };
+}