
We need to install the helper module not just on `etc` but also on all subdirectories of it too. Also, handle the case where we install a subdirectory with etc.install. Closes Homebrew/homebrew#26145.
We need to install the helper module not just on `etc` but also on all subdirectories of it too. Also, handle the case where we install a subdirectory with etc.install. Closes Homebrew/homebrew#26145.