(font-lock-*-face) <defvar>: Move.

(font-lock-*-face) <defvar>: Move.
(font-lock-defaults-alist): Mark obsolete.
(font-lock-mode, font-lock-mode-hook) <defvar>: Remove.
(font-lock-mode): Use define-minor-mode.
(font-lock-support-mode): Tweak type to default to jit-lock-mode.
(font-lock-turn-off-thing-lock): Be more explicit.
(font-lock-apply-syntactic-highlight): Use string-to-syntax after eval.
(font-lock-syntactic-face-function): New var.
(font-lock-fontify-syntactically-region): Use it.
(font-lock-doc-face): New.