Minor fixes after preloading easymenu

Minor fixes after preloading easymenu

* lisp/cedet/ede/dired.el:
* lisp/dired-x.el:
* lisp/filesets.el:
* lisp/follow.el:
* lisp/gnus/gnus-registry.el:
* lisp/net/eudc.el:
* lisp/printing.el:
* lisp/recentf.el:
* lisp/speedbar.el: Remove redundant require of easymenu; it is now
preloaded.
* lisp/org/org.el:
* lisp/progmodes/antlr-mode.el:
* lisp/progmodes/vhdl-mode.el:
* lisp/textmodes/reftex.el: Don't require easymenu in Emacs 28 or
later.

* etc/NEWS: Announce that 'easymenu' is now preloaded.