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/mmctl/default.nix

@@ -0,0 +1,24 @@
+{ lib, fetchFromGitHub, buildGoModule }:
+buildGoModule rec {
+  pname = "mmctl";
+  version = "6.4.2";
+
+  src = fetchFromGitHub {
+    owner = "mattermost";
+    repo = "mmctl";
+    rev = "v${version}";
+    sha256 = "sha256-FlqkY4LvAW9Cibs+3UkMDWA+uc62wMh13BllWuxjVZU=";
+  };
+
+  vendorSha256 = null;
+
+  checkPhase = "make test";
+
+  meta = with lib; {
+    description = "A remote CLI tool for Mattermost";
+    homepage = "https://github.com/mattermost/mmctl";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ ppom ];
+    platforms = platforms.linux ++ platforms.darwin;
+  };
+}