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/synth/default.nix

@@ -0,0 +1,40 @@
+{ lib
+, rustPlatform
+, fetchFromGitHub
+, pkg-config
+, openssl
+, stdenv
+, AppKit
+, Security
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "synth";
+  version = "0.6.5-r1";
+
+  src = fetchFromGitHub {
+    owner = "getsynth";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-AcAZjS2Wo0PRngf0eYrduEd6rZX5YpYxsWEp0wf9jvg=";
+  };
+
+  cargoSha256 = "sha256-mMGlUCvbXaO0XfMwVtpq7HENoSaXrQU7GSh7/OhYdus=";
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ openssl ] ++ lib.optionals stdenv.isDarwin [
+    AppKit
+    Security
+  ];
+
+  # requires unstable rust features
+  RUSTC_BOOTSTRAP = 1;
+
+  meta = with lib; {
+    description = "A tool for generating realistic data using a declarative data model";
+    homepage = "https://github.com/getsynth/synth";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ figsoda ];
+  };
+}