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/qrencode/default.nix

@@ -0,0 +1,47 @@
+{ lib, stdenv, fetchurl, pkg-config, SDL2, libpng, libiconv }:
+
+stdenv.mkDerivation rec {
+  pname = "qrencode";
+  version = "4.1.1";
+
+  outputs = [ "bin" "out" "man" "dev" ];
+
+  src = fetchurl {
+    url = "https://fukuchi.org/works/qrencode/qrencode-${version}.tar.gz";
+    sha256 = "sha256-2kSO1PUqumvLDNSMrA3VG4aSvMxM0SdDFAL8pvgXHo4=";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ SDL2 libpng ] ++ lib.optionals stdenv.isDarwin [ libiconv ];
+
+  configureFlags = [
+    "--with-tests"
+  ];
+
+  doCheck = true;
+
+  checkPhase = ''
+    runHook preCheck
+
+    pushd tests
+    ./test_basic.sh
+    popd
+
+    runHook postCheck
+  '';
+
+  meta = with lib; {
+    homepage = "https://fukuchi.org/works/qrencode/";
+    description = "C library for encoding data in a QR Code symbol";
+
+    longDescription = ''
+      Libqrencode is a C library for encoding data in a QR Code symbol,
+      a kind of 2D symbology that can be scanned by handy terminals
+      such as a mobile phone with CCD.
+    '';
+
+    license = licenses.lgpl21Plus;
+    maintainers = with maintainers; [ adolfogc yana ];
+    platforms = platforms.all;
+  };
+}