Remove most of the XEmacs compat code from ediff*.el

Remove most of the XEmacs compat code from ediff*.el

* lisp/vc/ediff-diff.el (ediff-word-1): Remove XEmacs compat code
and declare compatibility functions for obsolete.  Adjust all callers.

* lisp/vc/ediff-help.el (ediff-set-help-overlays):

* lisp/vc/ediff-hook.el:
(menu-bar-ediff-misc-menu, menu-bar-ediff-merge-menu)
(menu-bar-ediff-menu, menu-bar-ediff-merge-menu)
(menu-bar-epatch-menu, menu-bar-ediff-misc-menu):

* lisp/vc/ediff-init.el (ediff-device-type)
(ediff-window-display-p, ediff-has-face-support-p)
(ediff-has-toolbar-support-p, ediff-has-gutter-support-p)
(ediff-BAD-INFO, ediff-coding-system-for-write)
(ediff-read-event, ediff-overlayp, ediff-make-overlay)
(ediff-delete-overlay, ediff-color-display-p)
(ediff-display-pixel-width, ediff-display-pixel-height)
(ediff-region-help-echo, ediff-set-face-pixmap)
(ediff-paint-background-regions-in-one-buffer)
(ediff-clear-fine-diff-vector, ediff-mouse-event-p)
(ediff-key-press-event-p, ediff-event-point, )
(ediff-event-buffer, ediff-event-key, ediff-last-command-char)
(ediff-frame-iconified-p, ediff-frame-char-width)
(ediff-reset-mouse, ediff-frame-char-height)
(ediff-overlay-start, ediff-overlay-end, ediff-overlay-buffer)
(ediff-overlay-get, ediff-move-overlay, ediff-overlay-put)
(ediff-abbreviate-file-name):

* lisp/vc/ediff-mult.el (ediff-next-meta-item)
(ediff-previous-meta-item)
(ediff-replace-session-activity-marker-in-meta-buffer)
(ediff-replace-session-status-in-meta-buffer)
(ediff-redraw-directory-group-buffer)
(ediff-update-markers-in-dir-meta-buffer)
(ediff-update-session-marker-in-dir-meta-buffer)
(ediff-redraw-registry-buffer, ediff-set-meta-overlay)
(ediff-update-meta-buffer, ediff-get-meta-info)
(ediff-get-meta-overlay-at-pos, )
(ediff-get-session-number-at-pos, )
(ediff-next-meta-overlay-start)
(ediff-previous-meta-overlay-start, )
(ediff-meta-mark-equal-files):

* lisp/vc/ediff-util.el:
(ediff-setup, ediff-setup-control-buffer, ediff-recenter)
(ediff-recenter-one-window, ediff-toggle-read-only)
(ediff-file-checked-out-p, ediff-file-checked-in-p)
(ediff-toggle-wide-display, ediff-toggle-multiframe)
(ediff-toggle-use-toolbar, ediff-kill-bottom-toolbar)
(ediff-visible-region, ediff-scroll-vertically)
(ediff-scroll-horizontally, ediff-jump-to-difference-at-point)
(ediff-diff-to-diff, ediff-restore-diff)
(ediff-toggle-regexp-match, ediff-really-quit)
(ediff-cleanup-mess, ediff-highlight-diff-in-one-buffer)
(ediff-unhighlight-diffs-totally-in-one-buffer)
(ediff-save-buffer, ediff-make-cloned-buffer)
(ediff-make-indirect-buffer, ediff-remove-flags-from-buffer)
(ediff-place-flags-in-buffer1, ediff-get-diff-posn)
(ediff-clear-diff-vector, ediff-make-bullet-proof-overlay)
(ediff-submit-report, ediff-deactivate-mark)
(ediff-activate-mark, ediff-profile, ediff-print-diff-vector):

* lisp/vc/ediff-wind.el (ediff-control-frame-parameters)
(ediff-get-window-by-clicking, ediff-select-lowest-window)
(ediff-setup-windows-plain-merge)
(ediff-setup-windows-plain-compare, ediff-setup-control-frame)
(ediff-destroy-control-frame, ediff-make-frame-position)
(ediff-make-wide-display, ediff-get-visible-buffer-window):

* lisp/vc/ediff.el (ediff-version, ediff-documentation):