[O] Eldoc and setupfile issue

[Jamie Forth]

Hi,

Using the org-eldoc contrib, visiting a file with a setupfile keyword
seems to prevent global-eldoc-mode from enabling eldoc in org buffers.

Steps to reproduce:
1. emacs -Q -l minimal.el
2. open setup.org
   - eldoc is enabled
3. open test.org
   - eldoc is not enabled

GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.5)
Org mode version 9.2.4 (release_9.2.4-400-g2c8e8b)

--
Jamie

minimal.el
Description: application/emacs-lisp

# An empty file

#+begin_src elisp :results verbatim
  eldoc-mode
#+end_src

#+RESULTS:
: t

# A file containing a setupfile keyword.

#+setupfile: ./setup.org

#+begin_src elisp :results verbatim
  eldoc-mode
#+end_src

#+RESULTS:
: nil