bug#3549: 23.0.94; Remove empty custom group `refill'

"Drew Adams" <[email protected]>
Newsgroups gmane.emacs.bugs,gmane.emacs.pretest.bugs
Message-ID <[email protected]>
Likewise, empty custom group `oop'.

Someone, many moon ago, must thought that these would catch on and be useful
someday. (Maybe they will, but they can be rcreated then.)
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