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/wrk2/default.nix

@@ -0,0 +1,42 @@
+{ lib, stdenv, fetchFromGitHub, luajit, openssl, zlib }:
+
+stdenv.mkDerivation rec {
+  pname = "wrk2";
+  version = "4.0.0-${builtins.substring 0 7 src.rev}";
+
+  src = fetchFromGitHub {
+    owner  = "giltene";
+    repo   = "wrk2";
+    rev    = "e0109df5b9de09251adb5f5848f223fbee2aa9f5";
+    sha256 = "1aqdwmgdd74wq73f1zp28yqj91gd6p6nf9nbdfibl7mlklbzvak8";
+  };
+
+  buildInputs = [ luajit openssl zlib ];
+
+  patchPhase = ''
+    rm -rf deps/luajit && mkdir deps/luajit
+
+    substituteInPlace ./Makefile \
+      --replace '-lluajit' '-lluajit-5.1' \
+      --replace '_BSD_SOURCE' '_DEFAULT_SOURCE' \
+      --replace 'cd $(LDIR) && ./luajit' '${luajit}/bin/luajit' \
+      --replace 'config.h Makefile $(LDIR)/libluajit.a' 'config.h Makefile'
+
+    substituteInPlace ./src/script.c \
+      --replace 'struct luaL_reg ' 'struct luaL_Reg '
+  '';
+
+  dontConfigure = true;
+  installPhase = ''
+    mkdir -p $out/bin
+    mv ./wrk $out/bin/wrk2
+  '';
+
+  meta = {
+    description = "Constant throughput, correct latency recording variant of wrk";
+    homepage    = "https://github.com/giltene/wrk2";
+    license     = lib.licenses.bsd3;
+    platforms   = lib.platforms.linux;
+    maintainers = with lib.maintainers; [ thoughtpolice ];
+  };
+}