bug#27822: [PATCH] do not auto-remove external packages (fixes #27822)

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@gmail.com>
> Date: Wed, 08 Aug 2018 21:19:02 -0400
> Cc: 27822@debbugs.gnu.org
> 
> > +(defun package--user-installed-p (pkg)
> > +  "Check if the package is a user-installed package.
> > +PKG is a package name.
> 
> I think this is better shortened to
> 
>     Return non-nil if the package named PKG is user-installed.

Or maybe

  (defun package--user-installed-p (package)
    "Return non-nil if PACKAGE is a user-installed package.
  PACKAGE is the package name, a string."

Thanks.