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/archivers/pxattr/default.nix

@@ -0,0 +1,26 @@
+{ lib, stdenv, fetchurl, gcc }:
+
+stdenv.mkDerivation rec {
+  pname = "pxattr";
+  version = "2.1.0";
+
+  src = fetchurl {
+    url = "https://www.lesbonscomptes.com/pxattr/pxattr-${version}.tar.gz";
+    sha256 = "1dwcqc5z7gzma1zhis2md49bj2nq7m6jimh4zlx9szw6svisz56z";
+  };
+
+  buildInputs = [ gcc ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp pxattr $out/bin
+  '';
+
+  meta = {
+    homepage = "https://www.lesbonscomptes.com/pxattr/index.html";
+    description = "Provides a single interface to extended file attributes";
+    maintainers = [ lib.maintainers.vrthra ];
+    license = [ lib.licenses.mit ];
+    platforms = lib.platforms.unix;
+  };
+}