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/vpnc/default.nix

@@ -0,0 +1,42 @@
+{ lib, stdenv, fetchFromGitHub, fetchpatch
+, makeWrapper, pkg-config, perl
+, gawk, gnutls, libgcrypt, openresolv, vpnc-scripts
+, opensslSupport ? false, openssl # Distributing this is a GPL violation.
+}:
+
+stdenv.mkDerivation {
+  pname = "vpnc";
+  version = "unstable-2021-11-04";
+
+  src = fetchFromGitHub {
+    owner = "streambinder";
+    repo = "vpnc";
+    rev = "c8bb5371b881f8853f191c495e762f834c9def5d";
+    sha256 = "1j1p83nfc2fpwczjcggsby0b44hk97ky0s6vns6md3awlbpgdn57";
+    fetchSubmodules = true;
+  };
+
+  nativeBuildInputs = [ makeWrapper ]
+    ++ lib.optional (!opensslSupport) pkg-config;
+  buildInputs = [ libgcrypt perl ]
+    ++ (if opensslSupport then [ openssl ] else [ gnutls ]);
+
+  makeFlags = [
+    "PREFIX=$(out)"
+    "ETCDIR=$(out)/etc/vpnc"
+    "SCRIPT_PATH=${vpnc-scripts}/bin/vpnc-script"
+  ] ++ lib.optional opensslSupport "OPENSSL_GPL_VIOLATION=yes";
+
+  postPatch = ''
+    patchShebangs src/makeman.pl
+  '';
+
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    homepage = "https://davidepucci.it/doc/vpnc/";
+    description = "Virtual private network (VPN) client for Cisco's VPN concentrators";
+    license = if opensslSupport then licenses.unfree else licenses.gpl2Plus;
+    platforms = platforms.linux;
+  };
+}