c-update-modeline format for c-block-comment-flag

[Andy Moreton <andrewjmoreton@gmail.com>]

Hi,

The handling of c-block-comment-flag in c-update-modeline is
unfortunate:

(defun c-update-modeline ()
  (let ((fmt (format "/%s%s%s%s%s"
		     (if c-block-comment-flag "*" "/")
		     (if c-electric-flag "l" "")
		     (if (and c-electric-flag c-auto-newline)
			 "a" "")
		     (if c-hungry-delete-key "h" "")
		     (if (and
			  ;; (cc-)subword might not be loaded.
			  (boundp 'c-subword-mode)
			  (symbol-value 'c-subword-mode))
                         ;; FIXME: subword-mode already comes with its
                         ;; own lighter!
			 "w"
		       "")))

This fixed "/" in the modeline string forces this submode lighter to be
always present, and prevents the diminish or delight packages from being
able to remove or replace this lighter.

Can this be fixed for emacs-26 ?

   AndyM