Deleting compat code from commit 087b030001

[Arash Esbati]

Hi Keita,

can I delete this code in tex.el:

--8<---------------cut here---------------start------------->8---
(if (< emacs-major-version 27)
    (or (assq 'compilation-in-progress minor-mode-alist)
        (setq minor-mode-alist (cons '(compilation-in-progress " Compiling")
                                     minor-mode-alist))))
--8<---------------cut here---------------end--------------->8---

It was introduced with commit 087b030001:

  Simplify mode line for emacs 27

  * tex-buf.el: Don't add an entry in `minor-mode-alist' for
  `compilation-in-progress'. In emacs 27, compile.el adds a similar
  entry in `mode-line-modes'.

We require Emacs≥27 now, I think we can delete it.  WDYT?

Best, Arash