bug#3827: 23.0.96; doc view dependencies

[email protected]
Newsgroups gmane.emacs.bugs,gmane.emacs.pretest.bugs
Message-ID <[email protected]> 
Doc View says upon browsing a PDF:

    No PNG support available or some conversion utility for pdf files is
    missing.

Well it should say exactly what it tried.

P.S., Debian emacs-snapshot should "Suggests: ghostscript", so doc-view
will work.

P.S., upon
$ emacs a.pdf
there is a welcome to Doc View splash screen that the user only
sees for a second and then it is gone, unfindable.
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