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/misc/screensavers/alock/default.nix

@@ -0,0 +1,46 @@
+{ lib, stdenv, fetchFromGitHub, pkg-config, autoreconfHook
+, libX11, pam, libgcrypt, libXrender, imlib2 }:
+
+stdenv.mkDerivation rec {
+  pname = "alock";
+  version = "unstable-2017-07-20";
+
+  src = fetchFromGitHub {
+    owner = "Arkq";
+    repo = "alock";
+    rev = "2035e1d4a2293432f5503e82d10f899232eb0f38";
+    sha256 = "sha256-Rm00ytSfEv5Wljz4f/4bbyrK3sCV/oRUwz4DKx0pya8=";
+  };
+
+  PAM_DEFAULT_SERVICE = "login";
+
+  configureFlags = [
+    "--enable-pam"
+    "--enable-hash"
+    "--enable-xrender"
+    "--enable-imlib2"
+  ];
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [
+    autoreconfHook libX11
+    pam libgcrypt libXrender imlib2
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/Arkq/alock";
+    description = "Simple screen lock application for X server";
+    longDescription = ''
+      alock locks the X server until the user enters a password
+      via the keyboard. If the authentification was successful
+      the X server is unlocked and the user can continue to work.
+
+      alock does not provide any fancy animations like xlock or
+      xscreensaver and never will. It's just for locking the current
+      X session.
+    '';
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ ftrvxmtrx chris-martin ];
+    license = licenses.mit;
+  };
+}