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/openconnect/common.nix

@@ -0,0 +1,45 @@
+{ version
+, src
+}:
+
+{ lib
+, stdenv
+, pkg-config
+, gnutls
+, p11-kit
+, openssl
+, useOpenSSL ? false
+, gmp
+, libxml2
+, stoken
+, zlib
+, vpnc-scripts
+, PCSC
+, autoreconfHook
+}:
+
+stdenv.mkDerivation rec {
+  pname = "openconnect";
+  inherit version src;
+
+  outputs = [ "out" "dev" ];
+
+  configureFlags = [
+    "--with-vpnc-script=${vpnc-scripts}/bin/vpnc-script"
+    "--disable-nls"
+    "--without-openssl-version-check"
+  ];
+
+  buildInputs = [ gmp libxml2 stoken zlib (if useOpenSSL then openssl else gnutls) ]
+    ++ lib.optional stdenv.isDarwin PCSC
+    ++ lib.optional stdenv.isLinux p11-kit;
+  nativeBuildInputs = [ pkg-config autoreconfHook ];
+
+  meta = with lib; {
+    description = "VPN Client for Cisco's AnyConnect SSL VPN";
+    homepage = "https://www.infradead.org/openconnect/";
+    license = licenses.lgpl21Only;
+    maintainers = with maintainers; [ pradeepchhetri tricktron alyaeanyx ];
+    platforms = lib.platforms.unix;
+  };
+}