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/applications/networking/instant-messengers/ratox/default.nix

@@ -0,0 +1,37 @@
+{ lib, stdenv, fetchgit, libtoxcore
+, conf ? null }:
+
+with lib;
+
+let
+  configFile = optionalString (conf!=null) (builtins.toFile "config.h" conf);
+
+in stdenv.mkDerivation {
+  pname = "ratox";
+  version = "0.4.20180303";
+
+  src = fetchgit {
+    url = "git://git.2f30.org/ratox.git";
+    rev = "269f7f97fb374a8f9c0b82195c21de15b81ddbbb";
+    sha256 = "0bpn37h8jvsqd66fkba8ky42nydc8acawa5x31yxqlxc8mc66k74";
+  };
+
+  buildInputs = [ libtoxcore ];
+
+  preConfigure = ''
+    substituteInPlace config.mk \
+      --replace '-lsodium -lopus -lvpx ' ""
+
+    ${optionalString (conf!=null) "cp ${configFile} config.def.h"}
+  '';
+
+  makeFlags = [ "PREFIX=$(out)" ];
+
+  meta = {
+    description = "FIFO based tox client";
+    homepage = "http://ratox.2f30.org/";
+    license = licenses.isc;
+    maintainers = with maintainers; [ ehmry ];
+    platforms = platforms.linux;
+  };
+}