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/zrepl/default.nix

@@ -0,0 +1,47 @@
+{ lib
+, buildGoModule
+, fetchFromGitHub
+, makeWrapper
+, nixosTests
+, openssh
+}:
+buildGoModule rec {
+  pname = "zrepl";
+  version = "0.5.0";
+
+  src = fetchFromGitHub {
+    owner = "zrepl";
+    repo = "zrepl";
+    rev = "v${version}";
+    sha256 = "4q/wwlF11HPDS2lTXUizJ3RFQ9sX5qNnWZUKAgnvDiE=";
+  };
+
+  vendorSha256 = "xToq9pKAxxknh4kE8S3uUg5ySPMbJkLftkMhofNxotc=";
+
+  subPackages = [ "." ];
+
+  nativeBuildInputs = [
+    makeWrapper
+  ];
+
+  postInstall = ''
+    mkdir -p $out/lib/systemd/system
+    substitute dist/systemd/zrepl.service $out/lib/systemd/system/zrepl.service \
+      --replace /usr/local/bin/zrepl $out/bin/zrepl
+
+    wrapProgram $out/bin/zrepl \
+      --prefix PATH : ${lib.makeBinPath [ openssh ]}
+  '';
+
+  passthru.tests = {
+    inherit (nixosTests) zrepl;
+  };
+
+  meta = with lib; {
+    homepage = "https://zrepl.github.io/";
+    description = "A one-stop, integrated solution for ZFS replication";
+    platforms = platforms.linux;
+    license = licenses.mit;
+    maintainers = with maintainers; [ cole-h danderson mdlayher ];
+  };
+}