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/sync/rsync/rrsync.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchurl, perl, rsync, fetchpatch }:
+
+let
+  base = import ./base.nix { inherit lib fetchurl fetchpatch; };
+in
+stdenv.mkDerivation {
+  pname = "rrsync";
+  version = base.version;
+
+  src = base.src;
+
+  buildInputs = [ rsync perl ];
+
+  # Skip configure and build phases.
+  # We just want something from the support directory
+  dontConfigure = true;
+  dontBuild = true;
+
+  postPatch = ''
+    substituteInPlace support/rrsync --replace /usr/bin/rsync ${rsync}/bin/rsync
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp support/rrsync $out/bin
+    chmod a+x $out/bin/rrsync
+  '';
+
+  meta = base.meta // {
+    description = "A helper to run rsync-only environments from ssh-logins";
+    maintainers = [ lib.maintainers.kampfschlaefer ];
+  };
+}