bug#49734: 28.0.50; define-obsolete-variable-alias

[Glenn Morris]

Yes, but bear in mind:
1) The elisp manual has never been updated for this change.
2) The Emacs 23.1 change was not in NEWS.
3) Consider the byte compilation warnings for the following code in eg
Emacs 27.1:

(make-obsolete 'my-foo 'my-foo2)
(define-obsolete-variable-alias 'my-foo3 'my-foo4)

   foo.el:1:2:Warning: make-obsolete called with 2 arguments, but requires 3
Ie no warning for define-obsolete-variable-alias.