Re: Rewrite of vc-user-login-name

[Richard M. Stallman]

    Here's a patch that closes a long standing issue, removing the need for
    Tramp to advise vc-user-login-name.  I'm not quite sure how to install
    it, though: should I just remove the advice in tramp-vc.el?

What is the cause of your doubts?
In general, updating the source is all one needs to do
for a change in the Lisp code.  Occasionally one needs
to update loaddefs.el, but that's not relevant here.