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/os-specific/linux/google-authenticator/default.nix

@@ -0,0 +1,34 @@
+{ stdenv, lib, fetchFromGitHub, autoreconfHook, pam, qrencode }:
+
+stdenv.mkDerivation rec {
+  pname = "google-authenticator-libpam";
+  version = "1.09";
+
+  src = fetchFromGitHub {
+    owner = "google";
+    repo = "google-authenticator-libpam";
+    rev = version;
+    hash = "sha256-DS0h6FWMNKnSSj039bH6iyWrERa5M7LBSkbyig6pyxY=";
+  };
+
+  nativeBuildInputs = [ autoreconfHook ];
+  buildInputs = [ pam ];
+
+  preConfigure = ''
+    sed -i "s|libqrencode.so.4|${qrencode.out}/lib/libqrencode.so.4|" src/google-authenticator.c
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin $out/lib/security
+    cp ./.libs/pam_google_authenticator.so $out/lib/security
+    cp google-authenticator $out/bin
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/google/google-authenticator-libpam";
+    description = "Two-step verification, with pam module";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ aneeshusa ];
+    platforms = platforms.linux;
+  };
+}