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/applications/radio/rtl-sdr/default.nix

@@ -0,0 +1,44 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, pkg-config
+, libusb1
+}:
+
+stdenv.mkDerivation rec {
+  pname = "rtl-sdr";
+  version = "0.8.0";
+
+  src = fetchFromGitHub {
+    owner = "librtlsdr";
+    repo = "librtlsdr";
+    rev = "v${version}";
+    sha256 = "1fgxlkgmdchbrf0nn98ivjr6css5hak3608nr4xrf2qzf7xy2kdk";
+  };
+
+  postPatch = ''
+    substituteInPlace CMakeLists.txt \
+      --replace '/etc/udev/rules.d' "$out/etc/udev/rules.d"
+
+    substituteInPlace rtl-sdr.rules \
+      --replace 'MODE:="0666"' 'ENV{ID_SOFTWARE_RADIO}="1", MODE="0660", GROUP="plugdev"'
+  '';
+
+  nativeBuildInputs = [ pkg-config cmake ];
+
+  buildInputs = [ libusb1 ];
+
+  cmakeFlags = lib.optional stdenv.isLinux [
+    "-DINSTALL_UDEV_RULES=ON"
+    "-DWITH_RPC=ON"
+  ];
+
+  meta = with lib; {
+    description = "Turns your Realtek RTL2832 based DVB dongle into a SDR receiver";
+    homepage = "https://github.com/librtlsdr/librtlsdr";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ bjornfor ];
+    platforms = platforms.linux ++ platforms.darwin;
+  };
+}