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/nat-traverse/default.nix

@@ -0,0 +1,37 @@
+{ lib, stdenv, fetchurl, perl }:
+
+stdenv.mkDerivation rec {
+  pname = "nat-traverse";
+  version = "0.7";
+
+  src = fetchurl {
+    url = "https://www.speicherleck.de/iblech/nat-traverse/nat-traverse-${version}.tar.bz2";
+    sha256 = "0knwnqsjwv7sa5wjb863ghabs7s269a73qwkmxpsbngjw9s0j2ih";
+  };
+
+  nativeBuildInputs = [ perl ];
+
+  installPhase = ''
+    mkdir -p $out/bin $out/share/man/man1
+    cp nat-traverse $out/bin
+    gzip -c nat-traverse.1 > $out/share/man/man1/nat-traverse.1.gz
+  '';
+
+  meta = with lib; {
+    description = "NAT gateway traversal utility";
+    longDescription = ''
+      nat-traverse establishes direct connections between nodes which are
+      behind NAT gateways, i.e. hosts which do not have public IP addresses.
+      This is done using an UDP NAT traversal technique. Additionally, it's
+      possible to setup a small VPN by using pppd on top of nat-traverse.
+
+      nat-traverse does not need an external server on the Internet, and it
+      isn't necessary to reconfigure the involved NAT gateways, either.
+      nat-traverse works out-of-the-box.
+    '';
+    homepage = "https://www.speicherleck.de/iblech/nat-traverse/";
+    license = licenses.gpl3Plus;
+    platforms = platforms.all;
+    maintainers = [ maintainers.iblech ];
+  };
+}