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/tools/networking/openvpn/openvpn-auth-ldap.nix

@@ -0,0 +1,61 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, autoreconfHook
+, gnustep
+, re2c
+, openldap
+, openssl
+, openvpn
+}:
+
+stdenv.mkDerivation rec {
+  pname = "openvpn-auth-ldap";
+  version = "2.0.4";
+
+  src = fetchFromGitHub {
+    owner = "threerings";
+    repo = "openvpn-auth-ldap";
+    rev = "auth-ldap-${version}";
+    sha256 = "1j30sygj8nm8wjqxzpb7pfzr3dxqxggswzxd7z5yk7y04c0yp1hb";
+  };
+
+  nativeBuildInputs = [
+    autoreconfHook
+    gnustep.base
+    gnustep.libobjc
+    gnustep.make
+    re2c
+  ];
+
+  buildInputs = [
+    openldap
+    openssl
+    openvpn
+  ];
+
+  configureFlags = [
+    "--with-objc-runtime=GNU"
+    "--with-openvpn=${openvpn}/include"
+    "--libdir=$(out)/lib/openvpn"
+  ];
+
+  doCheck = true;
+
+  preInstall = ''
+    mkdir -p $out/lib/openvpn $out/share/doc/openvpn/examples
+    cp README.md $out/share/doc/openvpn/
+    cp auth-ldap.conf $out/share/doc/openvpn/examples/
+  '';
+
+  meta = with lib; {
+    description = "LDAP authentication plugin for OpenVPN";
+    homepage = "https://github.com/threerings/openvpn-auth-ldap";
+    license = [
+      licenses.asl20
+      licenses.bsd3
+    ];
+    maintainers = [ maintainers.benley ];
+    platforms = platforms.unix;
+  };
+}