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/misc/rw/default.nix

@@ -0,0 +1,26 @@
+{ lib, stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  pname = "rw";
+  version = "1.0";
+
+  src = fetchurl {
+    url = "https://sortix.org/rw/release/rw-portable-${version}.tar.gz";
+    # Use hash provided by upstream
+    sha256 = "50009730e36991dfe579716f91f4f616f5ba05ffb7bf69c03d41bf305ed93b6d";
+  };
+
+  makeFlags = [ "PREFIX=$(out)" ];
+
+  meta = with lib; {
+    homepage = "https://sortix.org/rw";
+    description = "Block device and byte copying program similar to dd";
+    longDescription = ''
+      rw is a command line program which copies information between files
+      or byte streams. The rw command is designed to be a replacement for
+      dd with standard style command line flags.
+    '';
+    license = licenses.isc;
+    maintainers = with maintainers; [ dtzWill ];
+  };
+}