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The main change is to only use the `category' text-property only when
available.  For that many calls are changed to use c-get-char-property,
c-next-single-property-change, c-sc-scan-lists,
c-sc-parse-partial-sexp, c-unmark-<->-as-paren.

* lisp/progmodes/cc-align.el (c-lineup-respect-col-0): New function.

* lisp/progmodes/cc-cmds.el (c-forward-into-nomenclature)
(c-backward-into-nomenclature): Use cc-subword if subword-mode is
not available.
(c-beginning-of-defun, c-end-of-defun, c-mark-function)
(c-indent-line-or-region): Use c-region-is-active-p.

* lisp/progmodes/cc-defs.el (c-version): Bump up to 5.33.
(c-use-category): New const.
(c-next-single-property-change): New macro.
(c-region-is-active-p): Prefer region-active-p when available.
(c-search-backward-char-property): Fix old min/max typo; probably
a copy/paste error.
(c-mark-<-as-paren, c-mark->-as-paren, c-unmark-<->-as-paren):
Turn them into macros that obey c-use-category.
(c-sc-scan-lists-no-category+1+1, c-sc-scan-lists-no-category+1-1)
(c-sc-scan-lists-no-category-1+1, c-sc-scan-lists-no-category-1-1)
(c-sc-scan-lists, c-sc-parse-partial-sexp)
(c-looking-at-non-alphnumspace): New macros.
(c-sc-parse-partial-sexp-no-category): New function.
(c-emacs-features): Add `category-properties' element.

* lisp/progmodes/cc-engine.el (c-invalidate-state-cache, c-parse-state):
Handle the case where categories are not available.
(c-record-parse-state-state, c-replay-parse-state-state):
Handle marker values.
(c-before-change-check-<>-operators): Look for the `syntax-table'
property rather than for the corresponding `category'.
(c-looking-at-decl-block): Remove unused var
`c-disallow-comma-in-<>-arglists'.
(c-forward-<>-arglist-recur): Remove unused var
`orig-record-found-types'.

* lisp/progmodes/cc-langs.el (c-modified-constant): New lang var.
(c-known-type-key): Don't make a list just to throw it away.

* lisp/progmodes/cc-bytecomp.el (cc-bytecomp-unbound-variables)
(cc-bytecomp-original-functions, cc-bytecomp-original-properties)
(cc-bytecomp-loaded-files): Re-set each time the file is loaded.
(cc-bytecomp-obsolete-var, cc-bytecomp-ignore-obsolete)
(cc-bytecomp-obsolete-fun): Delete unused functions.

* lisp/progmodes/cc-mode.el (c-just-done-before-change): New var.
(c-basic-common-init): Initialize it.
(c-common-init): Only use mode-require-final-newline when available.
(c-before-change): Check and set c-just-done-before-change.
(c-after-change): Re-set c-just-done-before-change.
(c-advise-fl-for-region): New macro.
(lazy-lock-defer-rest-after-change, lazy-lock-defer-line-after-change)
(font-lock-after-change-function, jit-lock-after-change):
Advise if needed.