Add a full set of CC Mode language variables to js.el.
This will allow js.el to work after maintenance changes in CC Mode, e.g. the fix to bug #11165. * lisp/progmodes/js.el (top level): Create a CC Mode derived language called js-mode and based on Java Mode. (js-mode): call c-init-language-vars for js-mode. Remove the direct settings of several CC Mode language variables which are now defined through the derived language mechanism. Call c-set-style and set up the needed style variables c-block-comment-prefix and c-comment-prefix-regexp.