(eval-when-compile): Don't define

(eval-when-compile): Don't define
add-submenu.
(verilog-xemacs-menu): Add :keys for C-M-a, C-M-e and C-M-h.
Remove.  Move contents to the only use ...
(verilog-menu): ... here.
(verilog-statement-menu): Remove.  Move contents to the only use ...
(verilog-stmt-menu): ... here.
(verilog-mark-defun): Simply call mark-defun for emacs.
(occur-pos-list): Declare for byte compiler.
(mode-popup-menu): Don't defvar.
(verilog-add-statement-menu): Remove.
(verilog-mode-hook): Don't add verilog-add-statement-menu.
(verilog-mode): Call easy-menu-add and set mode-popup-menu for
XEmacs.