add fish to /etc/shells (base-files)

[Andrew Schulman]

> While I'm always ready to reconsider previous decisions, this is how it 
> appears to be handled in Linux distros.  The implication thereof is that 
> (once all packages have been adapted) the default /etc/shells should 
> only contain those shells available by default (namely, sh, bash, and 
> /sbin/nologin), e.g.:
> 
> https://git.fedorahosted.org/cgit/setup.git/tree/shells

Agreed.

> Probably best if we have a cygport function for creating the necessary 
> postinstall and preremove commands.

Yes, that's what I was thinking.  I'll draft one when I have some time.
Andrew


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