intro-string in byte-compiled files

[Ulrich Mueller]

I wonder if the following code found in all byte-compiled files still
makes sense:

;;; This file uses dynamic docstrings, first added in Emacs 19.29.
(if (and (boundp 'emacs-version)
     (< (aref emacs-version (1- (length emacs-version))) ?A)
      (or (and (boundp 'epoch::version) epoch::version)
           (string-lessp emacs-version "19.29")))
    (error "`simple.el' was compiled for Emacs 19.29 or later"))

Emacs 19.29 was released 13 years ago. It is nice to be backwards
compatible, but as some point such things should be dropped.

Ulrich