Bind open-paren-in-column-0-is-defun-start to nil at some entry points.

Bind open-paren-in-column-0-is-defun-start to nil at some entry points.
* progmodes/cc-engine.el (c-invalidate-state-cache-1)
(c-parse-state-1, c-guess-basic-syntax):  Bind it here.
* progmodes/cc-mode.el (c-before-change, c-after-change)
(c-font-lock-fontify-region): Bind it here.