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/compression/xar/default.nix

@@ -0,0 +1,46 @@
+{ lib, stdenv, fetchurl, pkg-config, libxml2, xz, openssl, zlib, bzip2, fts, autoreconfHook }:
+
+stdenv.mkDerivation rec {
+  version = "1.6.1";
+  pname = "xar";
+
+  src = fetchurl {
+    url    = "https://github.com/downloads/mackyle/xar/${pname}-${version}.tar.gz";
+    sha256 = "0ghmsbs6xwg1092v7pjcibmk5wkyifwxw6ygp08gfz25d2chhipf";
+  };
+
+  nativeBuildInputs = [ autoreconfHook pkg-config ];
+  buildInputs = [ libxml2 xz openssl zlib bzip2 fts ];
+
+  patches = [
+    ./0001-Add-useless-descriptions-to-AC_DEFINE.patch
+    ./0002-Use-pkg-config-for-libxml2.patch
+  ];
+
+  postPatch = ''
+    substituteInPlace configure.ac \
+      --replace 'OpenSSL_add_all_ciphers' 'OPENSSL_init_crypto' \
+      --replace 'openssl/evp.h' 'openssl/crypto.h'
+  '';
+
+  meta = {
+    homepage    = "https://mackyle.github.io/xar/";
+    description = "Extensible Archiver";
+
+    longDescription =
+      '' The XAR project aims to provide an easily extensible archive format.
+         Important design decisions include an easily extensible XML table of
+         contents for random access to archived files, storing the toc at the
+         beginning of the archive to allow for efficient handling of streamed
+         archives, the ability to handle files of arbitrarily large sizes, the
+         ability to choose independent encodings for individual files in the
+         archive, the ability to store checksums for individual files in both
+         compressed and uncompressed form, and the ability to query the table
+         of content's rich meta-data.
+      '';
+
+    license     = lib.licenses.bsd3;
+    maintainers = with lib.maintainers; [ copumpkin ];
+    platforms   = lib.platforms.all;
+  };
+}