zonk *log-edit-files* for RCS (or when there is only one file)

[Thien-Thi Nguyen]

When i'm using RCS to version control a single file, ‘C-x v v’
(vc-next-action) shows a buffer *log-edit-files* with the name
of the file.  Since i use RCS typically on single files, this
information is unnecessary.  How can i disable *log-edit-files*
(but only for RCS)?  I suppose a related question would be how
to disable it under any VCS when there is only one file in play.

By "disable" i mean the buffer should not show up (i don't care
if it's generated and not discarded as long as i don't see it).

-- 
Thien-Thi Nguyen -----------------------------------------------
 (defun responsep (query)               ; (2021) Software Libero
   (pcase (context query)               ;       = Dissenso Etico
     (`(technical ,ml) (correctp ml))
     ...))                              748E A0E8 1CB8 A748 9BFA
--------------------------------------- 6CE4 6703 2224 4C80 7502

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