Also, put permanent-local property on variable so it's value won't get
killed by kill-all-local-variables. This makes it easier for non-CC
Mode derived modes to be initialized correctly.
(c++-mode, java-mode, objc-mode, idl-mode):
Remove obsolete variable c-double-slash-is-comments-p.
(c-initialize-cc-mode): Require 'cc-mode-19
if functionp is not bound. Check cc-mode-19 interface requirements.
(c-mode, c++-mode, objc-mode, java-mode, idl-mode):
Don't set comment-multi-line here.
(c-mode): c-comment-start-regexp uses
c-C++-comment-start-regexp to support line oriented comments.
(c-initialize-cc-mode): Move the calling of
c-make-styles-buffer-local into c-initialize-builtin-style.
(c-initialize-cc-mode): Run the c-initialization-hook, but only once
per Emacs session.
