Move read-multiple-choice to subr-x.el
* lisp/faces.el (read-multiple-choice-face): Fix doc string. * lisp/emacs-lisp/subr-x.el (read-multiple-choice): Move here from subr.el. * lisp/gnus/message.el (subr-x): Ditto. * lisp/net/nsm.el: Require subr-x for read-multiple-choice. read-multiple-choice doesn't need to be in the dumped Emacs, so move it to a less central file.
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