37e61aed62
This came up in https://github.com/Homebrew/homebrew-emacs/pull/158#issuecomment-172031003; `install_metafiles` is passed the current directory, which can be changed during installation by `Dir.chdir`. There may be cases where the metafiles are in a subdirectory, but my guess is those are rare and this is brittle and undocumented behavior anyway.