bug#51497: 29.0.50; (vc-print-log) broken over TRAMP

[Eli Zaretskii]

> From: Dmitry Gutov <dgutov@yandex.ru>
> Date: Sun, 7 Nov 2021 03:11:43 +0300
> 
> Failing that, I think we'll need to change the "literal pathspecs" 
> implementation to yet another approach (adding --literl-pathspecs flag 
> instead of manipulating file names). It comes with the same general 
> drawbacks as the env var (which is used under the hood), but the 
> explicit approach of specifying it in every command would avoid the 
> problem of my original fix for that bug.

Why wasn't --literal-pathspecs used in the first place? what are the
downsides?  IME, using magic file names is always worse, because it
can run afoul of various shells that consider some characters special.