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/backup/zbackup/default.nix

@@ -0,0 +1,36 @@
+{ lib, stdenv, fetchFromGitHub, fetchpatch
+, cmake, protobufc
+, libunwind, lzo, openssl, protobuf, zlib
+}:
+
+stdenv.mkDerivation rec {
+  pname = "zbackup";
+  version = "1.4.4";
+
+  src = fetchFromGitHub {
+    owner = "zbackup";
+    repo = "zbackup";
+    rev = version;
+    hash = "sha256-9Fk4EhEeQ2J4Kirc7oad4CzmW70Mmza6uozd87qfgZI=";
+  };
+
+  patches = [
+    # compare with https://github.com/zbackup/zbackup/pull/158;
+    # but that doesn't apply cleanly to this version
+    ./protobuf-api-change.patch
+  ];
+
+  # zbackup uses dynamic exception specifications which are not
+  # allowed in C++17
+  NIX_CFLAGS_COMPILE = [ "--std=c++14" ];
+
+  buildInputs = [ zlib openssl protobuf lzo libunwind ];
+  nativeBuildInputs = [ cmake protobufc ];
+
+  meta = {
+    description = "A versatile deduplicating backup tool";
+    homepage = "http://zbackup.org/";
+    platforms = lib.platforms.linux;
+    license = lib.licenses.gpl2Plus;
+  };
+}

pkgs/tools/backup/zbackup/protobuf-api-change.patch

@@ -0,0 +1,11 @@
+--- a/backup_restorer.cc
++++ b/backup_restorer.cc
+@@ -48,7 +48,7 @@
+   // TODO: this disables size checks for each separate message. Figure a better
+   // way to do this while keeping them enabled. It seems we need to create an
+   // instance of CodedInputStream for each message, but it might be expensive
+-  cis.SetTotalBytesLimit( backupData.size(), -1 );
++  cis.SetTotalBytesLimit( backupData.size() );
+ 
+   // Used when emitting chunks
+   string chunk;