Restore fontification of delimiters of multiline CC Mode strings.
E.g., on typing the closing delimiter of a string continued onto a second line, the opening delimiter retained its font-lock-warning-face. * lisp/progmodes/cc-defs.el (c-c++-raw-string-opener-re) (c-c++-raw-string-opener-1-re): New constants. (c-sub-at-c++-raw-string-opener, c-at-c++-raw-string-opener): New macros. * lisp/progmodes/cc-engine.el (c-raw-string-pos) (c-depropertize-raw-strings-in-region, c-after-change-unmark-raw-strings): Replace uses of open-coded raw string regexps by the new constants and macros in cc-defs.el. * lisp/progmodes/cc-fonts.el (c-font-lock-raw-strings): Ditto * lisp/progmodes/cc-mode.el (c-before-change-check-unbalanced-strings): Set c-new-BEG to the beginning of the string when we encounter its closing ". When not in a raw string, but in a string, clear syntax-table properties from its delimiters and set c-new-BEG/END to its limits. (c-after-change-mark-abnormal-strings): When applying syntax-table properties to string delimiters, also set c-new-BEG/END to ensure subsequent fontification.
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