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/applications/networking/cluster/kn/default.nix

@@ -0,0 +1,44 @@
+{ lib, buildGoModule, fetchFromGitHub, installShellFiles }:
+
+buildGoModule rec {
+  pname = "kn";
+  version = "1.4.0";
+
+  src = fetchFromGitHub {
+    owner = "knative";
+    repo = "client";
+    rev = "knative-v${version}";
+    sha256 = "sha256-Q67dictDE+HWw99lFAiidBvIL30mMAkjYb2CDLDcalw=";
+  };
+
+  vendorSha256 = null;
+
+  subPackages = [ "cmd/kn" ];
+
+  nativeBuildInputs = [ installShellFiles ];
+
+  ldflags = [
+    "-X knative.dev/client/pkg/kn/commands/version.Version=v${version}"
+    "-X knative.dev/client/pkg/kn/commands/version.VersionEventing=v${version}"
+    "-X knative.dev/client/pkg/kn/commands/version.VersionServing=v${version}"
+  ];
+
+  postInstall = ''
+    installShellCompletion --cmd kn \
+      --bash <($out/bin/kn completion bash) \
+      --zsh <($out/bin/kn completion zsh)
+  '';
+
+  doInstallCheck = true;
+  installCheckPhase = ''
+    $out/bin/kn version | grep ${version} > /dev/null
+  '';
+
+  meta = with lib; {
+    description = "The Knative client kn is your door to the Knative world. It allows you to create Knative resources interactively from the command line or from within scripts";
+    homepage = "https://github.com/knative/client";
+    changelog = "https://github.com/knative/client/releases/tag/v${version}";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ bryanasdev000 ];
+  };
+}