bug#4451: 23.1; EOL problems with vc-diff and cygwin

[Eli Zaretskii]

> From: Reiner Steib <reinersteib+gmane@imap.cc>
> Cc: 4451@debbugs.gnu.org, Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Thu, 15 Jul 2010 09:22:39 +0200
> 
> > So I agree with Stefan that you should simply not overwrite the
> > checked-out file with Unix EOLs.  We could install the change
> > suggested by Stefan (based on this analysis, I no longer object to
> > it), 
> 
> If nobody else objects, may I install[1] Stefan's patch?  Or we could
> make it depend on some variable as well ...

Fine with me.

> +(defvar vc-coding-system-strip-eol t ;; nil
> +  "When non-nil, don't inherit the EOL part of the coding-system.")

Instead of a slightly misleading name (you don't really "strip" EOL)
and double negation, I would suggest an option named
vc-coding-system-inherit-eol, non-nil by default (to keep the current
operation), and reverse the condition in the patch.