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/libotr/default.nix

@@ -0,0 +1,25 @@
+{ lib, stdenv, fetchurl, libgcrypt, autoreconfHook }:
+
+stdenv.mkDerivation rec {
+  pname = "libotr";
+  version = "4.1.1";
+
+  src = fetchurl {
+    url = "https://otr.cypherpunks.ca/libotr-${version}.tar.gz";
+    sha256 = "1x8rliydhbibmzwdbyr7pd7n87m2jmxnqkpvaalnf4154hj1hfwb";
+  };
+
+  patches = [ ./fix-regtest-client.patch ];
+
+  outputs = [ "bin" "out" "dev" ];
+
+  nativeBuildInputs = [ autoreconfHook ];
+  propagatedBuildInputs = [ libgcrypt ];
+
+  meta = with lib; {
+    homepage = "http://www.cypherpunks.ca/otr/";
+    license = licenses.lgpl21;
+    description = "Library for Off-The-Record Messaging";
+    platforms = platforms.unix;
+  };
+}