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/data/documentation/bgnet/default.nix

@@ -0,0 +1,35 @@
+{ stdenv, lib, fetchFromGitHub, python3, pandoc }:
+
+stdenv.mkDerivation {
+  pname = "bgnet";
+  # to be found in the Makefile
+  version = "3.1.2";
+
+  src = fetchFromGitHub {
+    owner = "beejjorgensen";
+    repo = "bgnet";
+    rev = "782a785a35d43c355951b8151628d7c64e4d0346";
+    sha256 = "19w0r3zr71ydd29amqwn8q3npgrpy5kkshyshyji2hw5hky6iy92";
+  };
+
+  buildPhase = ''
+    # build scripts need some love
+    patchShebangs bin/preproc
+
+    make -C src bgnet.html
+  '';
+
+  installPhase = ''
+    install -Dm644 src/bgnet.html $out/share/doc/bgnet/html/index.html
+  '';
+
+  nativeBuildInputs = [ python3 pandoc ];
+
+  meta = {
+    description = "Beej’s Guide to Network Programming";
+    homepage = "https://beej.us/guide/bgnet/";
+    license = lib.licenses.unfree;
+
+    maintainers = with lib.maintainers; [ Profpatsch ];
+  };
+}