bug#15234: 24.3.50; Make C-x u repeatable

[Jambunathan K <kjambunathan@gmail.com>]

Juri Linkov <juri@jurta.org> writes:

> You can make any command repeatable more easily with:
>
> (advice-add 'undo :after

Thanks.  I need to catch up with new advice functions. 
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Emacs Lisp is quite scary.  I don't mind customizing my Emacs but I want
 an interface that is simple.

    (mapc 
     (put 'undo 'repeat t)
     (list 'undo 'command-1 'command-2 'command-3))

May be a post-command hook that checks the 'repeat property and does
it's temporary overlay magic.

To top it all have a defcustom where I can add the list of commands.

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So the point really not that it be doable but that it be readily (made)
available (in a way that the user can relate) with no second thought.