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/misc/arp-scan/default.nix

@@ -0,0 +1,41 @@
+{ lib, stdenv, fetchFromGitHub, autoreconfHook, libpcap, makeWrapper, perlPackages }:
+
+stdenv.mkDerivation rec {
+  pname = "arp-scan";
+  version = "1.9.7";
+
+  src = fetchFromGitHub {
+    owner = "royhills";
+    repo = "arp-scan";
+    rev = version;
+    sha256 = "1mf7a4f9vzvnkiavc87aqyciswggsb4fpy7j05jxnvjyyxv3l7gp";
+  };
+
+  perlModules = with perlPackages; [
+    HTTPDate
+    HTTPMessage
+    LWP
+    URI
+  ];
+
+  nativeBuildInputs = [ autoreconfHook makeWrapper ];
+  buildInputs = [ perlPackages.perl libpcap ];
+
+  postInstall = ''
+    for name in get-{oui,iab}; do
+      wrapProgram "$out/bin/$name" --set PERL5LIB "${perlPackages.makeFullPerlPath perlModules}"
+    done;
+  '';
+
+  meta = with lib; {
+    description = "ARP scanning and fingerprinting tool";
+    longDescription = ''
+      Arp-scan is a command-line tool that uses the ARP protocol to discover
+      and fingerprint IP hosts on the local network.
+    '';
+    homepage = "http://www.nta-monitor.com/wiki/index.php/Arp-scan_Documentation";
+    license = licenses.gpl3;
+    platforms = platforms.linux ++ platforms.darwin;
+    maintainers = with maintainers; [ bjornfor mikoim r-burns ];
+  };
+}