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/dnsperf/default.nix

@@ -0,0 +1,44 @@
+{ lib
+, stdenv
+, autoreconfHook
+, fetchFromGitHub
+, ldns
+, libck
+, nghttp2
+, openssl
+, pkg-config
+}:
+
+stdenv.mkDerivation rec {
+  pname = "dnsperf";
+  version = "2.9.0";
+
+  src = fetchFromGitHub {
+    owner = "DNS-OARC";
+    repo = "dnsperf";
+    rev = "v${version}";
+    sha256 = "sha256-TWFi3oPTIKjBaw0Rq0AfZgxyVukvL2SWa2qvWw2WAQ4=";
+  };
+
+  nativeBuildInputs = [
+    autoreconfHook
+    pkg-config
+  ];
+
+  buildInputs = [
+    ldns # optional for DDNS (but cheap anyway)
+    libck
+    nghttp2
+    openssl
+  ];
+
+  doCheck = true;
+
+  meta = with lib; {
+    description = "Tools for DNS benchmaring";
+    homepage = "https://www.dns-oarc.net/tools/dnsperf";
+    license = licenses.isc;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ vcunat ];
+  };
+}