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/servers/kwakd/default.nix

@@ -0,0 +1,28 @@
+{ lib, fetchFromGitHub, stdenv }:
+
+stdenv.mkDerivation {
+  pname = "kwakd";
+  version = "0.5";
+
+  src = fetchFromGitHub {
+    owner = "fetchinson";
+    repo = "kwakd";
+    rev = "acdf0e1491204ae30622a60fde0bcae4769f78be";
+    sha256 = "1inf9ngrbxmkkdhqf1xday12nf0hxjxlx1810phkmivyyp6fl3nj";
+  };
+
+  postInstall = ''
+    serviceDir=$out/share/dbus-1/system-services
+    mkdir -p $serviceDir
+    cp kwakd.service $serviceDir/
+    substituteInPlace $serviceDir/kwakd.service \
+      --replace "kwakd -p 80" "$out/bin/kwakd -p 80"
+  '';
+
+  meta = with lib; {
+    description = "A super small webserver that serves blank pages";
+    license = licenses.gpl2;
+    maintainers = [ maintainers.nicknovitski ];
+    platforms = platforms.unix;
+  };
+}