bug#21751: 24.5; Undesirable sh-mode indent

[Eli Zaretskii]

> From: npostavs@users.sourceforge.net
> Date: Wed, 30 Aug 2017 19:50:30 -0400
> Cc: Phil <p.stephani2@gmail.com>, Oleksandr Gavenko <gavenkoa@gmail.com>,
>       21751@debbugs.gnu.org
> 
> > I guess sh-indentation should be made into an obsolete alias for
> > sh-basic-offset?
> 
> Here's a patch

Thanks.  If there are no objections in a few days, please push.